DP3,
As you can see from your experience and others here in this thread, the PG's core acts like a true pancake core. Just play it safe and treat it as such. The fact thhat those blocks in the bottom add to the flare and hook are a bonus.
The weight hole someone put 3" below their PAP acted just like others did in raising the bowtie (and adding earlier flare). It does that, in general, for cores with a differential greater than .040".
I drilled one with the pin under the middle finger, which for me is about 5.5" from my PAP. This caused a fairly high track for me, higher than normal. This is what normally happens when the CG is moved towards the negative side of the grip. This seems to imply that the pin on a PG should be treated somewhat (but not precisely) like the CG in a plain pancake core, with regards to static weights and the effect on the ball and the track.
--------------------
"None are so blind as those who will not see."