I don't think the 20psi in street tires is helping you. Low pressure is more for a drag radial designed to operate like that. Try upping it back up to about 30.
2003 Ford Focus ZX3 2.3l N/A = 221 HP, 162 ft-lbs, email@example.comMPH - SOLD
2006 Ford Fusion 2.3l Turbo = 244HP, 247ft-lbs
2014 Ford Fiesta 1.0; Turbo