Pennswood makes a super steep concave that Scumco uses for some of their decks (they call it the “deep dish concave”). I’m the same, mostly love riding really steep concave with steep nose/tail and that deep dish concave is my favorite.
Terror of Planet X uses Pennswood too but I think they mostly use their “matador” and “standard” concaves. Buzzbomb skateboards does the same. I’m currently riding the Mullen deck from Buzzbomb which I think is the “matador” concave (I think Scumco calls this their “silver spoon concave”, but I’m not positive) and it’s not as steep as the deep dish concave, but it’s actually still pretty steep and feels great. It’s got a sort of scooped/curved nose/tail rather than the usual angled one, which is interesting and pops well. I’m going to stick with those and the deep dishes for a while. Plus they are only $35 which is cool
Prior to that, I was riding a Real deck with the “I” stamped in the top (they use “I” to “V” stamps on top of their decks to indicate the steepness of concave with “I” being the steepest. If you are used to Pennswood shapes, that won’t seem steep at all to you, but it was the steepest I’ve seen out of those DLX decks (Real, Krooked, Antihero, etc...).
The only other deck I’ve ridden recently which had a fairly steep concave/nose/tail was the Matt Reason keys re-issue from Zoo York (Chapman wood). I think they still have some of those up on the Chapman site but you have to use the search bar to find them on there.
Hope that helps!