I disagree with using deca....I think a test/primo cycle would be nice. I would say if run correctly and with a good post cycle therapy you can keep 90% of your gains. With deca, your going to loose some- no matter what.
I'm not saying that deca doesn't have its place....I'm just saying that you will be happier long term with primo.
Having said that...if you go with deca, make sure your diet is on point so that you don't risk gaining fat. I've seen guys stay lean even when running a baby deca bulker....just need to keep an eye out.
Good luck