My suggestion: Don't bother to train the 25 and the 27 year old. Play them at SG/SF to make the most out of them but don't give them any minutes at PG.
One position train Kryst, Harrigan and Chrisodoulou at the PG spot in OD, HD and PS this season. If you feel like you need to give them some training at shooting buy some 18 year olds with respectable jump shot, add them to the training rotation for the few weeks when you train jump shot, sell them when you're done. It will give you a bit of extra money.