Like already said, big varied diet, few feeds a day, generous water changes and up the temp. My angels grew like weeds at 87.7F.
The higher the temp the more faster they metabolize, the more waste produced the more water changes needed. The more you feed the more they waste the more water changes needed. So raising the temp and feeding alone more means quite a bit of extra water changing, you will be doing it in power mode. Just make sure params are similar so you don't shock the fish while it is in a growing spurt.