This topic probably belongs in Bowyer's Bench.
However, thought I might get a quicker response here.

Question pertains to take down recurve bow.  If you changed the degree by 1% of limbs coming off riser from 21 to 20, would there be any noticeable change of performance in the bow?
Smoothness?
Weight change?
Taking into account different length limbs?

Thanks for any replies.

Changing from a 21 degree angle to a 20 degree angle makes the limb pad angle more acute, i.e., flattens it a little, which has the effect of increasing preload on the limbs.  If you didn't change anything else, it would increase poundage a tad. You may or may not feel a difference in smoothness.

I built a couple 3 TD longbows, changing the string angle from 14 to 12 added about 6# and was faster, plus quieter.

I doubt you are going to see a lot of difference in one degree... Orion pretty well nailed it.... It depends on the geometry in the limb and if it needs more reload or not....

I've seen guys use very thin shims on their limb pads to help balance out the limbs before much like fine tuning ILF limbs. I don't think it's something i'd recommend playing with on bolt down risers without talking to your bowyer.