Underdeveloped buds not reaching SCROG net (What to do)

I cut them. They will never reach the light source and use their energies to stretch. for what? from 0.5 gr to 1 gr maximum? cut them!

Look up "lollipopping cannabis", this may guide your thought processes........
Otherwise you can just leave them and let it be what it is going to be.
Nothing you can really do to make certain branches grow faster than others.

First, there's nothing you can do to "speed up" their growth except get light to them... You might try just some tucking - take the larger leaves that are shading them and tuck them under and away from the bud sites so that they're exposed... I also think that removing them isn't a bad idea if they're really small (some call me a heretic!) - but what's the point of asking the plant to put its energy into small bud sites that aren't going to be worth a damn? I'd rather the plant send its energy to the GOOD bud sites! But it's your call....

Good luck!