I like a slight rattle in my front truck and a solid loose-medium in the back one. I shave down my ace bushings and remove all washers from the front truck and the top one from the back.
I tried tightening my front truck recently because i was worried i was fucking myself, and I did notice it was easier to get out of crooked grinds... everything else sucked. I was expecting flip tricks to feel awesome, but I am so used to doing little counter balances when i preload for shit that things felt off with the tighter front. I know you can grow accustomed to anything if you skate it long enough, but I've already spent years learning to skate loose.
The biggest thing was that i missed the feeling of being able to suddenly change direction or quickly correct direction. That is a feeling i have to have if im gonna enjoy skating fully, it just feels right.