Sure-Kit Designs How-To Video Lowering the Dress Bodice Underarm - Minor Tune-Up, and the instructions on page 16 of the Sure-Fit Designs Dress Kit Instructions Book to tune-up my sleeve pattern.
I guess I should have read these instructions first, because with my first test bodice the sleeves were very tight since I have large upper arms. So I applied these instructions and widened the sleeve pattern upper arm width. I also lowered the underarm just a bit as this video suggests doing. Not everyone is going to need to do this, but my test muslin now has sleeves that fit and I can really move, stretch and reach up high.