Depending on how long you are planning on using these products, have a two or four week break after using for four or eight weeks respectively. For the best effects and results from the stack, you're better off using it for ~8 weeks.
You're 170 pounds - make sure that you dose correctly and optimally (your IGF-2 dosing is only half of what it should be). See YOUR optimal dosing/timing for Applied Nutriceuticals products re best effects below:
Dose 1 - 3 caps first thing
Dose 2 - 3 caps 40 min pre-training
Dose 3 - 2 caps pre-bed
Non-Training Days (you can use this dosing if you train first thing or close to)
Dose 1 - 4 caps first thing
Dose 2 - 4 caps pre-bed
Dose - 4 caps first thing
It's not that many pills, but you don't need to add anything to it, no. However, if you want more help re endurance, then I recommend adding in Drive - will definitely make the stack better than ever, and I can attest to this from personal experience (Drive/IGF-2/FREE TEST is one of the best - if not the best - stacks I have used re endurance boosting and muscle gains).