That's better info!
I see no options in ACATune 1.7 that require > kick 2.0, so it *should* be safe to rule out the ACA. It could some autoconfig issue with/without the ACA on. Acatune has some PCMCIA options, but I don't think PCMCIA slow will help. The PCMCIA reset option when softkicking takes place, maybe.
I have hardware kick 3.1, I could find a PCMCIA CF+card and test, but then again I have ACA630, not 620. So it's unknown how helpful that is.