Sorry to hear you are in pain again as it sounded like you had found a balance with the walker. I'm scratching my head a little because everything I have been advised points towards using the best support appropriate to the level of weight bearing you specifically need. That is very individual and hard to measure. Put us in a line, same leg, same procedure and same days post op. We are all going to be different. Some needing a walker for a few weeks and others abandoning all aids before the first week is up. I'm still leaning quite heavy on my crutches at 3 weeks post op. I keep trying a light touch, even tried one crutch but I'm just not ready. I have a significant and uncomfortable limp without leaning on the crutches. It's that weight bearing through the arms that causes shoulder and arm pain for me. Personally, I just don't like the walker.
I've heard of people becoming reliant on walking aids because they are nervous of falling and that's another matter. I think it's a case of you knowing your body better than anybody else. You have a range of support aids to pick from. Maybe use what is comfortable to relieve your arm symptoms such as the walker but have a few sessions experimenting with the other aids. Basically keep testing to see if you can manage them without overly stressing your arms and shoulders? The ultimate aim is a graduate towards a comfortable, pain free walk, without a limp.