Upgrade 2260B power supply

We have started some testing with the Keithley 2260B 80V series power supply, and have realized that we need to upgrade. For specifics, we currently are using the 720W rated power supply for a setup at 48V, but have encountered issues of tripping the OCP of the unit. The average power draw we have been recording is 480W or 10A draw, but I assume we must be hitting fluctuation spikes that have exceeded the 15A limit at this voltage. I would be happy for any different opinion or troubleshooting if there is a way of better recording the active draw of the unit.
1) Are we able to return the units we have to have them exchanged or physically upgraded to 1080W rated units?
2) Are we just out of luck?

It's unlikely you'll be able to upgrade unless you're still in the return period. You can put 2 or 3 of these units in parallel which would solve your problem. You'd need to purchase a 2260-006 cable to put 2 in parallel or a 2260-007 cable to put 3 in parallel.