Thanks dudes! Yeah, 97a is what I was leaning toward. OJ, bones, or maybe even satori or Santa Cruz.
I feel like 97 are not grippy enough for really slippery ramps, so something more like 95 work best, as per comment below, but the 97 duro Spitfire F4 56mm classics I have are really good on just slightly slippery surfaces. Some of the guys I skate with always ride the older bigger OJs or Slimeballs in more 60-61mm size in 95 or 97 and those things are amazing, but many people don't want wheels quite that big.
Would it be absolutely stupid to buy the 58mm OJ natas 95a hardlines? Entering crusty ground/wooden skatepark winter season i'm looking for something better than my 55mm OG classics. I like bigger, fatter wheels. I've only skated bones and spitfire in the last 10 years so I have no idea if OJ is worth it or not.
I got some (more so for others who wanted grippy / softer wheels) and they would be perfect for that sort of situation, after having a skate on their boards.
Anything a little more on the softer and bigger side is ideal for me, so although they are not quite as fast as other wheels of 99 to 101 duro, they don't slip out and the slightly bigger size means they hold up better than smaller wheels.
Pretty much all the slippery ramps / parks I skated were more often on setups that had either 95 duro or even 92 duro Spitfires in the Soft D range, which you cannot get anymore, but there are other wheels out that are about the same.
The 92 duro are definitely way slower, but around 95 might be the easiest combination of not too soft / slow but not too slippery / sticky on that sort of surface.