Try using macros. It slows you down by not allowing you to queue and therefore add delays but it's better to play proper but a little bit slower than play like someone who just doesn't care (that's what's most frustrating about getting a 'bad' player in df, they either ignore you or just cuss you out).

Tie OGCD actions you always wanna use up to GCD actions that make sense. Not sure how smn plays these days but using /ac fester, /ac ruin allows you to mash out ruin and use fester as soon as they're up (can maybe even add up rouse). Or /ac bane, /ac miasma 2 (have to be up close). Or /ac eye for an eye and /ac virus (virus on the target, eye for an eye on the targets target). Or /ac rouse, /ac spur, /ac enkindle.

There's more to macros with /hotbary copy or change or set that can also help with manual pet control but I'm not sure you wanna bother since I think you dont do most 8 mans?