Funny you say all of that....because the 8.5 car is the only 4mod i've driven/practiced/raced with in the last several months...I loved driving that car so much I bought one of my own lol. I have an 8.5 on order, but had this 13.5 laying here and couldn't wait for the 8.5 lol. Yesterday was first day driving the 13.5 4mod, and it was MUCH faster laptime wise (smoother) the 8.5 is faster point to point, but also MUCH harder to keep it on my line.
I also DO drive with the very tip of my finger when I drive the 8.5 car...it's my 9 year old son's car and we have the trigger modded with foam/heat shrink so it fits his finger perfectly....I can only get about half of my finger nail in his trigger lolol.
I do consider myself fairly smooth with the trigger....I learned a long time ago that rolling on/off the trigger is very important to being smooth...the lower the turn motor, the more important it is to roll on/off the gas. higher turn motors it doesnt seem to have as much influence.