It has been my understanding that CPR does not have any protein in it so once a week would be fine. Also, as regards Aphogee, I use my every 4-5 weeks regardless of my hair state (it's kind of like a regimen with me). I use to use it right after a relaxer but i don't think that's a good idea now
. You can do a light protein treatment (ie. Nexxus kerphix - that's the only other one i use) about 3 days prior to your relaxer and 3-5 days after your relaxer you can use the aphogee.
If I am incorrect about the wait, i'm sure one of the other hair experts will kick in and correct me.