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Hi, my name is Kerry
It sounds like you have a slipping propeller hub on the starboard side.
Remove the propeller and check it for a chewed up hub.
If the hub looks okay, put paint marks on the hub and prop and reinstall and go for a run.
If the marks end up in a different place, the hub is slipping.
Another easier way to check is if you have a spare prop, try changing props.
If the hub is slipping, you can have a new one pressed it at a propeller repair shop.
If a known good prop still doesn't solve it,
you also have a cone clutch in the upper unit which could be slipping.
Sounds good,..til then.