Yes, the G12H75 Crème back.
There is some differences between the open vs sealed. Open back they seem a bit warmer which gives them a vintage character. However in a sealed 412 they sound huge. Slight mid shift to a lower frequency than the V30, but no sacrifice in the top end. I found them to be perfect with the Roadster head. V30 would get a bit muddy for palm muting such that I had found it hard to dial out the bottom end on the amp as it is a dark amp to start with. Running both cabs with the Roadster is best (mix of G12H75 and the V30). The JP-2C on the other hand, I would be happy either way. Thought the palm muting chug sounded much better with the crème back compared to the V30 (I was using the same amp settings to compare the two so perhaps change in general eq or the 5 band eq would work). One I pulled the gain pull switches and used shred, the G12H75 crème backs seemed to sound the best.
Now it will come down to recording in a mix. I have been working on a project but held off as I ordered the JP-2C. Now I will see how the different cabs will make it in the cut or not. Also will have a chance to try the cab clone, along with sm57 and perhaps an RE320 along with the Rivera Rock Crusher recording attenuator. 4 channels for one amp seems a bit overkill but sometimes it works once blended so you can record what you hear vs tone loss due to mic response. I will see how far I get. May end up using both cabs, one for rhythm and the other for lead.