Any Enanthate ester should be run for 10+ weeks...
I wouldn't say it comes on slow...4-5 weeks, which is common for all Enanthate compounds. It also isn't "heavier"...the ester weight is the same for test-e, mast-e, tren-e, etc.
You also don't need Caber for a test/primo/dbol cycle. None of those compounds bind the progesterone receptor.
So are you saying that HG primo is not any more painful (or difficult) to inject ml for ml than HG test-e? That will be a pleasant surprise for my 2012 cycle.
Do you think 15 weeks for a second cycle with 600mg depot a week sounds reasonable?