First the starting issue. 75% of the time it acts totally normal. The rest of the time it turns over like it's out of gas. The only way I can get it to start is to pull the neutral override and give her a little gas. She runs totally fine. Idles fine and runs great. I dont know what giving an efi engine a little gas does but thats the only way to make her pop. Second my trim on the way up is a "little bitchy" it kinda cuts in and out on the way up and needs the button pressed a couple of times to get the job done. Same story at the drivers seat or the engine switch.
The below shown trim troubleshooting guide indicates that a "jerky" up/down trim may be caused by either a low oil level or a tilt ram piston ball not seated (displaced, dirt, or nicked seat). I would suggest that you also check the shop manual for your particular motor for additional troubleshooting and repair guidance. These trim systems are fairly simple but I would not suggest messing with them without having a shop manual for a reference.
1996 Mercury 150HP V6 carbed outboard motor and Maxum 1900XR bowrider boat
You EFI guys are spoiled rotten. On a carb motor, you have to flip the right levers and push the right buttons, varying with water temp, air temp, moon phase, and PMS status of the motor, plus hold your mouth just right.