Do you know if this retard in my ignition is good or bad for the engine?
This is good when using HHO.

Is there vacuum at the port you are using at idle. I thought there was no vacuum at idle or maybe very very little. You really do not need any HHO at idle. It takes more HP to make the needed amps than any possible gain at idle. My reactors turns off at idle automatically with a switch on the throttle body. At idle the ratio of HHO to air to fuel is much more than when running and this cause the ECM to change the trims making them go richer.