There is no steroid that is better than another at "keeping gains" post cycle bro..........it all has to do with RECOVERY of HPTA.
ALSO...you will loose a lot of water gain when you go off test IF you did not use an estrogen inhibitor like arimidex. Even an estrogen blocker like Nolva helps here. You should keep almost all of your lean mass gains IF you recover rapidly.
Do this.......run your sust at 500 per week with biweekly injections at least. Stop the sust after week 6. You really should front load the sust at 600 on day one and then do your first biweekly injection at 250 three days later. This will REALLY help get the blood levels up quickly.
If you can get ahold of some tren then start the tren at 50 per day during weeks 7, 8, and 9. Three days after the last shot of tren hit the clomid hard. FRONT LOAD the clomid at 300mg on day one in divided doses and then continue with 50-100 mg for ten more days and then do 50 per day for another ten days.
During these three weeks on tren you will loose all the water gain from test yet strength and size gain will continue. This is the correct way to "harden up"