My only caution with this is that most bow shops today know nothing about Traditional Archery. There are a few hidden gems out there that are knowledgeable but not many.
@Jmort1754 do you happen to be within driving distance of RMS gear in Denver? If so they will have knowledge staff and lots...
Look up the origional The Push video. Start there. The Push has lots of good info especially there early stuff.
I also reccomend The Masters of the Barebow series. Lots of good info there.
Finally Tom Clums Total Archery Mechanics. I believe all his stuff is available behind a pay wall at...
One more thought. I just reread your post. If a 340 is showing weak out of your 25 pound bow, there is something else going on here. Because that result is simply not a correct result. That 25 pound bow should be something in the 600 to 700 spine range. Some more ideas.
1. You are shooting...
@Tilzbow is giving good advice. Likely too stiff and deflecting off the riser.
Two other thoughts.
1. You are shooting right handed. Correct? Because results are completely opposite if your shooting lefthanded. Unlikely solution but wanted to double check.
2. I would raise up your...