@fazm. First I must admit I was wrong about the settings of a skytraq rover, it seems to be set from factory. Although I found a place in gnss viewer where you can disable qzss (maybe to get higher Hz nmea output)
But it seems to be difficult to keep a fix, but it does not explain why you are not able to change base settings without going to only float.
Perhaps try msm7 as torriem does.
In following link you see others having problems with skytraq.
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