Mercury 135 Trim Issue
 

Hey Guys,
Having issues with the trim on the motor. It seems to stay up no problem when there is no load on it - but at full throttle it doesn't seem to have the power to trim out as much as it use to. The motor is a late 80s - early 90s Mercury 135 Black Max. I checked the trim fluid reservoir and topped it up and that still made no difference. Is there something I am missing?

Thanks! https://cimg4.ibsrv.net/gimg/www.off...e051960afe.jpg
https://cimg8.ibsrv.net/gimg/www.off...51a43a72c1.jpg