I have two SW CAH boys, now 6 and 9,  both of my boys slept 7 to 7 for a very long time,  years, .... in fact they still sleep from 8-7 and 9-7 respectively.  Anyway it has worked for us to space three times while they are awake.  My kids have done well,  good levels and growth for the most part.  I think if it is going OK without waking then keep it up,  if you run into problems then change.

 

Good luck