I just started a 10-12 week Test Prop cycle at 150mg EOD (525mg a week) last week and I've been thinking a lot about what to do for my next cycle. Time on + PCT = Time off , and then I was to go directly into another cycle.

Everybody always says you should stick to the basics, don't go introducing multiple compounds just yet, etc. But there has to be a reason why people use multiple compounds so early. If I wanted to run the same exact cycle again (525mg prop a week), would I still be making the best gains I can or would I be limiting myself somewhat ? Will my body already have gotten used to that and respond as well ? When would someone need start using compounds like Tren or Deca ? How long can I keep running test only ?