Neither of the changes you’ve made affects starting tyre pressure. Go with what is on your door jamb, either 32 or 33 I believe. You can always play a little from there but only a pound or two either way.
From where did you get the tire pressures? Is it a track spec? Mine (non-HP Mach 1) has 2.2 bar for all wheels printed on the door sticker.I can tell you that running 28lbs on cup 2's is not enough. This is 2 days of on track driving about 6 hours actually on track talking. My Cup 2's, R.I.P. had a lot more meat left in the centre 8 inches of the tire than the shoulders. I was running -3.0 deg camber / -.5 deg toe up front and -2.0 deg camber / +2.5 deg toe out back per Steeda (since I have an all Steeda suspension). I would start at 31 lbs if I had a chance to so it again. It also looks like my Sport 4s on a second set of HP wheels need a bit more pressure as well. (video included) Ive included what Ford recommends but it was not enough per my experience.