Btw, for voltmod...
Took both nst and j4b's advice.
Installed a 10K trimmer pot to replace the resistor and set at 7.5K.
Getting 1.68MH dev side and 1.5-2.0MH pool side with < 5-6% HW errors.
Too scared to measure watts though, because it may not be worth it and I had so much fun doing it.