ithinktherefore wrote:
>System seems fine now on most days, but part of today, it couldn't get below 78... high 90's outside

how's it doing now?

have adjusted my thermo to run the XL19i smaller compressor for 55 minutes (unconditionally) each time either temperature *or* humidity setpoint is triggered. When the 4.0 ton stage 2 starts, it normally runs only for 5 or 10 minutes and shuts off, often staying off in the hottest part of the day for up to 45 minutes.

This has resulted in a very steady 44-46% RH with inside temp at 77F daytime, 76F at night.