sorry I haven't read anything from you about delays, where is it? I think there is a misunderstanding here.
I don't understand in which way proII resolution is related, I'm receiving at the IF port, sampling rf with RTL-SDR.
I attach a video here where it can be seen that the issue is about the panadapter function with SDR=>Radio tracking activated.
With tracking function disactivated the spectrum is very good.
73 de Phil, iz1fks