I do pop-ups with a simular formula (70% hydro 2% oil, IDY/not SD, CF 4-5 days).
I make Pala and DSP/Sicilian with it.
When I make Pala it's super light, bubbly, and crispy.
My process for parbake pan is slack balls (1-6 hours), pan, let rise 6-10 hours. parbake with jack on the edges @450 for 8 min (low fan convection), cool.
I too pocked bottoms. I like the crumb texture with this but it can casue me to have about 5% of the parbakes be so bubbly it's hard to use them. I've noticed the longer I slack then the tighter the crumb and less pocking on the bottom.
I think when the are fully proofed before streching they get degassed when panned. Then a full second rise with tighter crumb. More like a Sicilian than a Roman. When I strech/pan with less slack time they get are less degassed and retain larger bubbles.
I'm considering testing proofing in pan then degassing and reproofing to see the results. It might wokr better for my production process to extend the proof to 16 hours.
I have reballed or degased 4-7 day CF dough at least twice and it will proof back up. It ends up with a tighter crumb but totally works. I got the idea from threds here about reballing and also the CPR method from Moderenst bread.
I'm still refining the produciton process. It's really a whole different time line and produciton even though the formula is the same.
If you look at what John and Chris do at Metro...it's a 61% hydro, they fully CF 4-5 days, slack 6 hours, pan and proof overnight before parbake. It has a pretty tight/uniform crumb and basically totally degassed when put in the pan.
You might just try really degassing it well when you pan it.
I don't have a lot of SD experience so it might react differently than IDY.