Okay, I located a superdrone seller - thanks for the PMs!
Based on all the reading I've done, SD gives great gains, but a bridge is needed to maintain those gains as long as possible (to keep as much as possible). Many recommend the following cycle/bridge:
Superdrone - 10/20/20
Epi - 0/0/30/40/40/40.
All along, I was assuming my 6-weeks cycle would look like this:
SD - 10/20/20/20
Epi - 0/0/0/30/40.
My thought was - use SD as long as possible to put on as much size as possible (so extend SD to 4 weeks) and then use Epi for the remaining 2 weeks to attempt to maintain. What am I missing??