[[email protected]]

Jeff,

This will depend upon the signals coming out of the new thermostat that you use but the original thermostat has a quirk in that the condenser motor will get both a low speed and high speed signal once the second compressor kicks in. That is because the condenser motor gets it’s power from the same relay as the compressor. It looks like you have used four relays meaning you have the same situation. I don’t think you want the low speed and high speed windings of the compressor motor powered at the same time.

The solution is to add one more relay. If it has both NO and NC terminals then run the power for the low speed throw the NC terminals. Trigger the relay with the signal for the second compressor. That way when the 2nd compressor fires the low speed circuit for the fan motor is interuppted. There are other ways, but that is the way I have done it.

I know you are electrically savvy, but if you want a schematic, give a shout, and I will cobble one up

Nice creative solution !!!!

Yes that is exactly my plan, those relays have no and nc contacts. The power to the condenser fan relay will be derived from the load side of the compressor number one relay, this will help eliminate a relay. I am actually adding two more larger relays for the compressors as the relays pictured are only rated for 12 amps, so they are going to trigger larger relays to switch the compressors on. I will post a wiring schematic once I get it finalized and that will make things easier to see. I have a rough layout but I am still fine tuning to capture most of the original functions. 
The indoor blower motor may only run on high speed but I am still working that out.