Why would you cycle 350 test for 16 weeks anyways

I have no issues extending it for 20 weeks, I want to play it safe and avoid as much sides as possible, what is so wrong on going for 350 per week?

Blasting and cruising ❌ Cruising and cruising ✅

Because many people prefer you run the same amounts they do, or run the bro knowledge minimum, which is 500, and think anything less will not be effective. If 350 works for you and does what you want it to, then that's all you need. Though most new folks don't run 20 week cycles just FYI. You get into the likelyhood of diminishing returns at that length.