I'm not a fan of the ZenitCo PT series stocks and never have been. Yes, they are functional and have lots of adjustment but they are heavy and IMO pretty damn ugly. They do give you a nice feature if you use the B13 side rail in that you can close the PT stocks without removing the B13 and your optic, but there again I also do not like the B13 side rail itself. I know they have a great reputation but to me it's one of the least effective rail designs on the market. There, I said it
B33 is a better solution than B13 in my opinion as well, and that pretty much kills any reason I would have to use the PT stocks
I can't comment on the ACE over the SGL. To me that all comes down to personal preference. I have never personally though the Galil or the ACE rifles were as great as they are said to be and I still prefer the AK74 by a long shot. I have never owned an ACE myself but I have shot them, and while they are definitely really nice rifles to me they aren't doing anything that ZenitCo doesn't also do (except be somewhat cheaper, especially nowadays, which is a fair point)
All night fighting rifles are heavy when suppressed with optics, lights and lasers added, even ARs. You get used to the balance, or deal with it as best you can. I am not an operator or super high speed by any stretch but in my experience if I stay on the sling while I'm hunting the weight and balance isn't terrible. No way would I want to road march without a sling, but for relatively short hunting stalks even without a sling isn't terrible