A 3 week cycle of those long-acting esters is, like pretty much everyone said, a complete waste. Those esters you should use for 10-12 week for best benefits. If, for some reason, you have to do a short cycle, use very fast-acting compounds. Test prop, NPP, orals like dbol, etc. 3 weeks of prop/npp/dbol would add some solid muscle as long as you kept the estrogen under control.