Plug recommendation please

Currently flying a Flair Extra 300S with a Moki 135. Flies fine but I
don't think the engine is running as well as it could. Can anyone
recommend which type of plug I should use for this engine please?
Currently running on OS 8 but local dealer reckons OS A5 would be
better.
TIA
cheers,
Len
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Len Cuff
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