1972 Front Disc Brake Conversion

Well, I don't know how to say this but there is absolutely something wrong with your disk brakes then.

The Pirate Jack kit is based on '73+ Mopar disks, and in the physical world we inhabit there is no test where OE 73+ disks lose to OE 10" drums.

Not sure if you have some kind of mismatch of components, or if the cheap Chinese parts that come with the PirateJack kit are not the same quality as the OE parts, but the 73+ disks outperform the 10" drums in every way, shape and form. If yours do not, there is a problem.
No idea, all new stuff.. even put on EBC pads to help.. BUT they have almost no miles on them so far, they "Work" but i wouldn't trust them to panic stop.. going to get them broke in all the way first.. Thing is.. Drums take much less pressure to run (being manual that matters) and discs don't self energize which once again for manual matters.. but i will figure it out. Not sure if the OP is going power or manual is all.