That makes sense. And humbling to say the least. Lol. Today, just because I was bored with shooting the 30# bow, I got out the Blacktail Elite which is 55# @ 28” (Im guessing 59-60# at my 40” draw, and I shoot it SOOO much better than the 30# bow even though I do have some shake at full draw. Do you guys think that may be because the heavier pull makes for a cleaner release? It’s the only thing I could think of.
You shoot it better because your arrow has a flat trajectory rather than an extreme arch, and more arrow speed as well.
Keep working that 30 pounder. It won't hurt to start working your 55 into your daily routine for a half-dozen arrows or so. It will help build the muscles you are strengthening with the 30 pounder and it will also be an indicator of progress...I'm guessing your shaking is going to diminish over time and eventually go away altogether.
Getting back to your weight training; doing a lot of reps with a light weight with toughen and work harden your muscle, but neither increase the size nor raise the bar in terms of limitations. You need to work-harden your shooting muscles and perfect your draw, anchor and release, but it can't stop there. Once you begin to have control in that area, you should start moving up the ladder with a heavier bow (not necessarily 55#, mind you) but moving up nonetheless, which is why I had initially suggested a replaceable limb bow. But any way you accomplish this is OK. But as with weight lifting, if you can bench 200 and stay there, 200 is all you will ever be able to press.
I find that drawing and holding a heavier bow for a count of 5, then letting down, resting and repeating a half dozen times (as opposed to actually shooting the heavier bow) will give you all the isometric advantage of shooting without affecting your TP issues.
You might be shooting improperly spined arrows from your 30#er too. If they are properly spined for your 55# bow they will be way heavy for a 30# bow.