You might also want to consider a smoother drawing bow that still maintains a high IBO rating. Like the new Bowtech Liberty, Merlin with Omega, Darton with CPS, Parker with EZ Draw cam, etc. Heck, look at the Jeff Murray add for Mathews, he' s complaining of needing a lessor draw weight due to shoulder issues, and says the LX draws so smooth he can draw more weight with it

I know you don' t want calculations, but there all I got, and most of the above listed bows have a reputation for delivering their stated speeds. I found with my bow, the rules of thumb of 1 fps for every 5 grains didn' t really work, more like 1.5 fps through a range of 350-500 grain arrows. Using this I can estimate within a few fps of the chrono reading. I also only have 2 brass nocks on my bowstring.

Assuming a smooth drawing bow at 50#s with an IBO of 305ish (hits most of those above), Potentially you could hit that with a 250 grain arrow. With your 84 grain heavier 334 grain arrow, you could expect to lose around 25 fps due to arrow weight, and another 15 or so due to draw length. That would put you at 40 fps less than IBO, or around 265.

If possible I' d visit some shops and draw some of the smoother drawing bows available, and see what you think your shoulder could actually handle, and go from there...