I don't really understand the point of golden savanna. Isn't it just golden buffalo but with slightly different theme (and not even that different?) Golden buffalo is a good game, just don't understand why they made something so similar. I don't think I'll ever actually hit a 1000x+ feature in that game though, I know it's there but it's not going to actually happen.
I like games that can give you something like 300x wins without concentrating too much of the rtp in nearly impossible to hit 2000x wins. Most slots seem to aim for the opposite though, they want you to burn through your money on meaningless wins while dangling the 1000x carrot in front of you that you'll likely never hit in most of them. If the game is a true high variance game though, then I don't mind the rtp invested into 1000x wins, just don't like the kind of "hole in the middle ones" that usually only pay 20x for a feature but still dangle the 1500x carrot in front of you.
3dice has a couple weird games like that, an example is fortune falls which is a low volatility game but still has around 600x wins for the top feature. Games like gemini, club sanguine, berrini seem to have a decent zone of potential pays (club sanguine is a little weirder but it's probably the best slot for payouts in the high variance section in my opinion). There's also penta pay which is a high volatility classic slot but the payout potential is pretty clear. Loose deuces video poker is also pretty good since you have a clear goal of 4 of a kind 2's for 500x.
I think all the recent releases which tend to be on the high variance side are all right, can give decent wins but they're also kind of money eaters. They're all decent games (haven't tried dice fusion though), maybe lycanthropics is the best of the bunch. None of them are really exactly what I'm looking for though.