I'm thinking that 100mg/Day of a c17aa oral would constitute a blast for me.

Sure, I knows guy who used DBOL for 6mo straight,
but he's cruising, if it really can be called so,
on 2+ grams of AAS pr week, usually going for 5+ grams and adding in slin and GH whenever he has the money to do so.
So I guess everyone is different.

But I wouldn't run orals, at least not in that dose,
during a cruise.