Thanks @Stefan Schippers @yrrapt @Adrian Freed!
It was the end of the day and I was apparently going into completely the wrong direction. I was kinda assuming no W an L would be minimal sized, and was caught in a mental loop of more drive current -> increased width -> increased capacitance -> decreased size. I did also experiment with higher voltages, knowing it was invalid. That did improve speed slightly.
I basically just graduated from my master IC design, so having a bit of a rough start with new everything and no guidance, but I'll manage hopefully. I'll read those paper and play around more later with a fresh brain.