With two 2000s in parallel you could also run the Iota and get maybe 155 amps to do a faster 50-80. One 2000 won't run the 100 amper.
You really ought to have a Trimetric monitor in the mix. That would mean changing your wiring plan so that the shunt is just outside the battery compartment. The neg wires from both the Iota (if not using the frame) and MeanWell would go to the 500a shunt and then a fat wire goes from the shunt to the battery neg post.
The existing battery to frame "ground" would also now go from the frame to the shunt first, and not to the battery, so that might mean another hole in the battery box? No big deal if so.
