sd is more of a spike for the beggining of cycles. such as jumpstarting injectables. the sd would give you more mass to the stack since the two previous phs were more hardening agents but due to the short time you have on the sd before you hit your pct youre more than likly going to have trouble holding onto the gains you made near the end of your cycle. you could do this but you might lose some to most of it in your pct due to the rapid weight gain and your body not being used to the new gain and then trying to restore your natty levels of hormones. just save the sd and either run it at the beggining of a cycle and bridge it into something or just run a solo. sd is that good.