I thinking you will like Vortex. I will use it with the RP and even though I'm a lightweight compared to you at about 160 it still works well. It will flatten but its soft hand that makes it so nice to climb on also allows it to return to normal much faster than firmer ropes.... I'm going to try it with Vortex this afternoon which is a listed rope.
These mechanicals really do work best with ropes leaning towards the kernmantle side of things. I’m over 225 with all my gear on and had a great time years ago with 11mm KMIII, and even Escalator. Can’t shock load these ropes if the belay device is set to slip just above WLL. I’m pretty sure @macswan rocked 1/2” KMIII on his Runner with much success for quite a while.I'm probably 20-30# over listed WLL geared up. It really flattens out the line. I'm going to try it with Vortex this afternoon which is a listed rope.