I had more of a think on it and realized I could add a 240mm aio, and fairly easily, by virtue of using the matx board. This gave enough room to mount the rad next to the psu but with enough of a gap to allow air in from the expansion slots and from the 120mm case fan. So, I snagged a corsair h100i platinum on a prime day deal and installed it. Side benefit is that it also feeds a ton of air to the video card, and coolant temp is only about 5C above the case temp at full load (~40C) so the card runs cooler with lower fan rpms than before.
The system is overall quieter under load as the fans don't need to go much over 1500rpm to keep the cpu cool, where the noctua air cooler would ramp up under load and be fairly audible. It should have enough cooling capacity for the WX chips now, and also allowed me to mount my 2nd hdd back in it's original spot below the bd drive.