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2005 Mercury 75hp 2 stoke, only getting 3000rpm Max Rev at Full throttel

Hello everyone, I took my boat out for the first time this weekend. Boat started great with no issues, after doing a lap around the lake i accelerated to full throttle. The tach maxed out at 3000rpm, normally i hit 5000rpm full throttle. Boat has fresh gas and oil. I removed the carbs to clean and inspect, all carbs are clean, i also cleaned out the fuel filter. I noticed that the top cylinder spark plug was very clean, the lower 2 plugs were oily/dirty. Has anyone ran into this issue? Thanks!!
 
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