Yeah, as annoying as it is, clearing everything & assembling piece by piece seems to be better.
At this point, all I've done is install Package Control, my theme, and a snippet. I'm far from my normal setup, and resting CPU is 2% and active CPU is 8%. Memory remains at 132 MB while resting & active.
Worth mentioning that these numbers now reflect 1 project workspace (instead of 5) and 0 tabs open.