First, yes, PPU ammo isnt all that expensive even now, so if I were you I would buy a few more boxes of it just to have on hand.
The second thing I would do, is spec out that factory ammo. Get it's COAL, neck diameter, and its cartridge Base to Ogive. Then dissect the cartridge and I would take notes on the bullet: Bearing surface, Base to ogive, weight, length, diameter. Do similar for the case, get the OAL, the shoulder measurement, and the case neck thickness. Look at the powder and see if you can tell anything about it. Spherical or stick powder etc. Do some calculations with the bullet you pulled and see how far off the lands it sits with the factory loaded specs.
Of course the next part is a wild ass guess, but see if some the of the specifics you learned to tweak your handloads. Something about those factory specs might jump out. For example, I was working on handloads for my 270 with hornady interlocks. Well the factory ammo with interlocks were for some reason shooting better than my handloads with the same bullet. Taking some notes on the factory load, I found out that the interlocks I was using were undersized by half a though. I had not thought of looking at my bullet diameter. Switched bullets and everything got better.