I've been fighting this same issue. Health problems have me down to much lighter bows, 33-38# at my 25" draw. The kicker is, some i can shoot, some i can't, depending on their power curve. I've been buying/trying a lot of different bows finding what works for me.
one thing I'm finding is that, as kshunter55 mentioned, my beloved longbows clearly tend to stack toward the end, while recurves, which I had not shot previously, tend to be a smoother draw for the same end weight, particularly vintage recurves. I guess it has to do with the compression factor of a thick narrow limb vs. a wide thin limb.
I've tried some vintage recurves and found them really comfortable, even beyond my 38#. I have a 51# at 28 (44# at my 25") Super Kodiak that I can shoot if I don't overdo it. It actually pulls much easier than a couple of 35 - 38# longbows I have.
I've also tried some really highly touted new recurves, looking for a bit more speed. However, what I'm finding is that the way the bowyers are getting that speed is to front load the power curve. This means you end up drawing more "inch pounds" before you reach weight. Won't work for my shoulder. I had a big disappointment yesterday. I got two gorgeous Predators, one a 44# that I can shoot (38 for me) and a heavier one I can't shoot. Even though I can shoot the 44, it's just not as comfortable a draw as my old Super Kodiak of the same weight.
So, what I'm finding is that it is very much a matter of how the particular bow is tillered, as well as looking just at what type of bow it is.
This reminds me a bit of sailing... years back, we all went to highly designed fin keel boats looking for speed. They're fast, but you have to work at sailing them, being in control every second. Some of us older guys started going back to old full keel designs that were slower, but much easier to sail. You could leave the tiller to go below and get a beer. I guess speed isn't everything ... :^)
For me, at this point, it looks like I'm going to spend a lot of time with the old Super Kodiaks and stop chasing the latest speed bow.
Dick in Seattle
kshunter55