Hello,
I do not believe the 1/16" difference in the shoe depth will cause a problem, if it is too tight you could sand or file the shoes down a little.
Choose stamp option 2950.
30" Series 380 with stamp option 2950 will carry a window sash weight range of 28 through and including 32 pounds.
This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.