I just finished 2 PTP cyles and now I'm feeling pretty strong.

But I feel like I need to do something else now, which will obviously be higher reps and less weight.

Now all other programs are longer than 2 week PTP cycles, so in designing one, how long can I stay away from the heavy weights before my strength starts going down? Would it benefit me to have a "heavy day" once every two weeks or something just to make sure my muscles don't forget what heavy weights feel like?

Cuz I'd be really ****ed if I exercised another way for a while and then couldn't even squat 225 when I finished (which has happened before).