I don't think it's necessarily the transfer timing. Soooo going off the numbers on the wiki Gila is 123' transfer and 178' exhaust, blowdown of 27.5.
I don't have much Gila experience so ima go off my experience with polini. Wiki numbers on polini are 114' transfer, 164' exhaust, 25 blowdown. I haven't modified my transfer timing, but I did open up the transfers at the base and ground out some of the webbing in the intake, as much as I could while preserving the boost port angle. I also cut auxiliary ports into the exhaust, without raising it. With a simonini pipe, I'm revving out over 13k. So with less transfer and exhaust timing than gila, it's still revving higher. Ik cutting those auxiliary ports did increase the blowdown even tho it didn't increase the duration.
If it's the same setup I remember you having, that monster Gila bk100, I bet there's more to be had in different pipes. Like with that 14k metra 65 ya had, what pipe and transfer or decking did ya do with that? Like you've done it before, maybe there's some direction to be had from that
Euro drag dudes rocking fat short pipes, I bet that's where it's at