So I did more reading, searching and poking around. The version of APP-2.53 that I am using I found on one of the forum posts, it has the extra options FAUTO, FSCAN & FNORM in the Sync Mode menu but this version does not seem to have a functioning calibration program. Whereas the latest versions download-able on the main firmware release post, APP-2.53, doesn’t have those Sync Mode options anymore but I can nicely calibrate ch A but not ch B. Ch B’s reading while trying to cal jump around, a lot.
Is there a beta APP firmware that I could try?