If you got 75 TPs then you got the WT+ Tier Points, which, i'm afraid, is exactly what you're entitled to for an MFU booking up to NCW, let alone F. MFUs seem to be treated a bit like mileage bookings - you get no miles or TPs for a redemption booking at all, and for MFU bookings you only get miles and TPs for the class you paid for, not the class you then upgraded to with your miles. There's a lot on various threads on this board about this. You're actually quite lucky that you got the miles and TPs at all, as many FT'rs on here have had problems in the past where their MFU was incorrectly posted with 0 points or miles, which they then had to chase up.

I'm sorry it's not the news you wanted to hear, but it's what the Exec Club will come back and tell you. Also, if it was me, i'd be too busy bragging about the fact I got an F flight for a $400 upgrade in the first place :-).