If you inject Sust often enough, there is no roller coaster. I would suggest injecting EOD to ED, depending on the dose. The benefit of using Sust, is that it will start acting faster than a traditionl long ester test. So, I find that instead of waiting 3-4 wk to see the early signs of being "on", sust will make these effects happen much quicker. I would expect under 3 wks and it will continue to improve over several more wks as the long ester builds. Sust is a great idea for someone that wants to bulk, make quick gains and not use an oral to "kick start" their cycle.
Even if you were to run Sust at 1cc 2x wk, your gains would probably end up the same as .5cc EOD. So don't over think it too much.
I like Sust for the off season. I find that it is more likely to produce water retention than cyp or test e, and thus can possibly lead to better off season gains.