Its seems like my starboard motor has just started or is getting more noticeable that when I take off it revs about 500-800 rpms higher than my port engine. Is this something that is common or is there something else I should start looking at.

I'm running stock 500 EFI's.

The starboard engine also runs about 25-degrees hotter as well, with a slightly lower oil pressure, not much though. I had both impellers changed the start of the season and that didn't correct my temp variance, I'm going to swap thermostats and see if that changes anything.

Also, I noticed that I'm loosing some gear oil out of my reservoirs. They are both down about the same amount, approx 3/4" - 1" from full. It takes about 6 or so outings to loose it. I never see any oil in the water, I also pulled the boat and didn't notice anywhere on the drives that looked oily either. If my showers aren't working properly and causing the drives to get hot can you burn oil in these?

Any help and insight would be greatly appreciated.

check your props and skegs. if you never noticed this before and you have ample attentive hours then you must have a problem. rpm with temp usually as a problem isnt coincedence. hows your water pressure

Props and Skegs look perfect.

I think I may have a bad injector on my port motor which is causing that one to lag, rather than the other to over rev. The port motor when warm from running doesn't fire right up, it cranks a bit before firing. I was told this may be due to a leaking injector.

check your plugs

what do you guys recommend using for plugs, what brand?