I would not do any preworkout forumulas NO2 / caffeine while on hdrol. The blood pressure can become a problem as your cycle progresses. Alot of people have had to add in additional hawthorn berry above and beyond what is in the cycle assist products myself included. I now take cycle assist 2x daily, plus hawthorn berry 3x daily on any hdrol cycle. hdrol takes about 3 weeks to kick in and really notice strength gains. You can run the creatine on cycle if you want, I like to save the creatine for the last week when the gains can start to wind down to give that last week a little extra.
Anyways with or without the low dose of test I would still run the hdrol at 75 per day. Start the preworkout again the day after your cycle ends.