Hi Paul,
Yes, the '45 is certainly an addictive pistol and so full of character. No surprise really that you love it to bits.
I don't own a '75, but it's at the very top of my list as my next gun, having had a few brief shots with them. I don't know anything about the Air Match. But what I do know is that the 75's little brother, the HW40, is a very, very accurate pistol and easy to extract the accuracy from, too.
On inspection, the 75 feels, to me, to be a more substantial, more classily and robustly built platform and oozing more finesse. The '40 exhibits a little muzzle flip, I couldn't detect any with the '75.
Not cheap, but lovely.