I didn't use the smooth function at all for MAF tuning. All the part throttle stuff is up to 7500 ha, after that is WOT tuning. I'd get it as close to 0 as possible on part throttle stuff. Also I had all the PE tables 0'd out when tuning. After I was happy I threw the PE vs time back in. I'd have to check my tune when I get home to be 100% though.