I am running a 919 with mercury 225 pro xs . The boat has raptors, with lithium trolling batteries, mega live and 360. Base line running 5750 at 71.5 mph with 24p fury 3. I have ran the atlas jack plate from 8-12 and tried 4 different prop without much change. I tried a 24 tempest at 5850 at 71, a 23 fury 3 at 5830 71.4 , and a 24 fury4 at 5780 at 70.2. Dealer is saying my lithium batteries are cause my slow woes that the boat need more stern weight. I do have all my heavy tackle in the rear port storage box. Is there a better prop option or should I have a prop worked. I am thinking adding cup for bow lift and cutting the barrel of the prop down to reduce stern lift in order to settle the stern. Any input would be greatly appreciated.