It kind of sounds like you tweaked SS into a low volume, low strength developing, low hypertrophy developing program and the last few months of it probably were less productive than you'd want them to have.
I think that switching to intermediate programming likely holds increased strength gainzZz, hypertrophy (only if you're gaining weight) increases, and ultimately development as a lifter. You're 6'0- you should probably be thinking about 220-240 my friend.
So, I'd recommend a TM split method, HLM, or similar- eat such that your weight is going up 1/4lb per week or so, and readjust your perspective if you can so you're not pressured into being skinny.