Question O2 sensor calibration

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That sounds normal?

Reaching 1.5+ already shows that the sensors can read higher than typical diving setpoints 1.0-1.4--the main purpose of that cell check IMO. More so than trying to re-validate "100%"

A ppO2 ~1.5+ @ 6 metres would be ~94+% oxygen? ~5% inert gases are probably not going to impact deco in meaningful ways when that shallow.

Sitting at ~1.5 (or 5.5 metres) is probably not going to make or break one's deco. Many would also be comfortable at ~4 metres if it's the actual ceiling. Pure(ish) O2 doesn't care, the 'oxygen window' actually looks mathematically the same there when vetted (except for those believing 6 metres will keep their microbubbles smaller.)

A ~5% margin that shallow shouldn't be making much difference for typical deco or oxtox, compared to the already quite beneficial off-gassing gradients, and several other conditional/personal/situational factors
 
1.55 is always my goal. Realistically as soon as you exhale after the flush you are introducing new inert gas so it won’t stay high for long and totally forcing 100% of your counter lung volume out in a flush isn’t likely. Sounds like you’re doing it right in summary.
 

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