John, I am going to give you some direct and absolute advice here. Read carefully ....
I do a few leg presses, extremely light weight looking for flex not muscle building. Then a 3 minutes of eliptical and 3 minutes of stationary bike. On the bike, if the seat is all the way back, I can get over the top on the pedals. This is just a stretching warm up. Then I go into the pool for one half hour of walking, kicking and some swimming.
This is way too much for 8 weeks out.
You should do
NO leg presses yet
NO elliptical, just stationary bike and no more than 5 mins
NO kicking and swimming in the pool yet, just 30 mins of GENTLE walking
My question is, should I be doing the heel slides and pulling back into the discomfort zone and holding it for count of 10, repeatedly? Is this the only way that I am going to get more ROM?
Heel slides is pretty much ALL you need to do. It sounds like you do it perfectly but you only need to do it about 4 or 5 times a day and 5-10 times each session.
Each morning I expect to be able to descend the eight steps and not feel the stiff pinch in each knee.
Don't expect anything! Just let it be a surprise when it happens. I took me nigh on four months before I could go upstairs normally, 5 before I could do it coming down. And that's pretty normal.
I know it is a 12 month program but I think I should be seeing more results by now.
Who told you that? Actually it's closer to a 6-12 month programme. Nothing's cast in stone so the less goals you set, the less you will be disappointed.
I will admit one thing. I have not been faithful with my list of exercises that I got from the hospital and PT. I have been substituting working around the yard, washing vehicles and the gym/pool. What do I need to do to loosen up these knees and get more ROM so I can ride my recumbent bike outside?
It's more what you DON'T do that loosens them up. All that activity is way too much for 8 weeks out. WAY too much. Throw the exercise sheets away and just concentrate on more gentle activity. Your knees are still healing and to do that they need rest not activity.
From what I am reading, I think I am doing too much. I am starting the 8th week on Tuesday. I am walking, working around the yard and going to the pool every day for a constant half hour workout of walking and kicking. I feel worse now than at my 5th week. My feet get stiff and to sit on chair with feet on floor, it bothers me. Walking slower now and my legs bother me.
That's because, as I said before, you are doing too much. Your legs are still at the 'angry tissue' phase where they are struggling to heal and need more rest than activity.
(getting the message yet?

)
I am think of taking about 2 or 3 days off to rest and see if things relax and feel better. The knees do not look swollen but there may be some swelling inside.
LOTS of swelling inside! I shall be giving you some articles to read, you've probably had them before but a little revision doesn't hurt!
I do ice a couple of times a day and massage my legs and feet often.
Twice a day is hardly worth the effort. Better than massaging is elevation while you are icing, have your feet up "toes above nose" for at least an hour at least 4 times a day. Can't beat it for getting on top of swelling.
Do you feel it is a good thing to take a few days off and not exercise?
That's not the best way, much better is to reduce what you are doing each day - considerably.
Now let me give you some specifics:
Progression of activity for TKRs this suggest what you should be doing on a weekly basis. You will note that on week 6 onwards it says (you can convert a lot of this to more masculine activities of course!)
Weeks 6 and onward
Start taking car trips to the shops but keep them short and sweet at the start, no longer than 15-20 minutes
Take at least one 5 minute rest while you are out.
Activity: ironing, washing, meal prep but get someone else to clear up after, wash up but someone else clears the table, brings you the dirty dishes, dries and puts them away after, not you!!
Bed making and changing sheets, cleaning bedrooms etc., can wait until about
week 8 by which time, all things being well, you should pretty much start getting back to normal. But if it takes a bit longer, don''t worry about it.
Note the "START getting back to normal! And this is for ONE knee!
Swollen and stiff knee: what causes it? you mentioned swelling inside - this explains it
Elevating your leg to control swelling and pain proper way to elevate
Knee Replacement - Where Am I in Recovery?
These two explain how long it takes for our bodies to heal
How Long Does Healing Take ......
Chart representation of TKR recovery