I'd be more inclined to go back to a pair of 17V Vmax 120W panels and your Solar 30 bungholer PWM Charge controller, and get what you get with the controller putting out 15.0V to your Sweeper batteries, and call it good. Probably 14 - 14.5 Amps, maybe a bit more, with fat enough wire. $250 US in panels, and $31 for the PWM, and what ever for fat wire to minimize losses. Seems tried and true. You get 210 watts at the battery, pretty consistently and you know where the other 30 watts went. No brainer, for me at least.
What do you have now in the MPPT controller and the 30V 230 watt panel, $$$ wise, that makes it worth how temperature sensitive it is for amps output, or amps missing? Seems like a solution looking for a problem?