I ended up going with 2x 185H-C1400B ( 74watts each COB max ) 296 all
The COBs are 35V/1280mA. The HLG-185H-C1400B delivers constant current with an output of 71-143V. Your design of 2 COBs per driver won't work. It will probably blow the COBs due to too high a voltage. Use one HLG-240H-C1400B to drive all four COBs in series. It is rated at 250W, and 89-179V. You can then drive the COBs up to 47.6 watts each.
If you must go to 290W, use one HLG-320H-C2100B. It's good from 76-152V. At 35V /2100mA it works out to 73.5W each or 294 watts total. (COBs drop 35V each so 4 X 35V X 2.1A = 140V / 294 watts) Make certain you get appropriately sized heat sinks.