Arggh. I used my new compression tester and it gave me some bad news. Cyl1 85 psi Cyl 2 70 psi. My old one’s calibration was way off. I’ve got a spare RD-19 powerhead I came across on craigslist I’ll dink with and install the atom modules, Thank you Lindy46, FrankR, and Wedgie for your help.