You're welcome.

Sounds like the lift pot is out of adjustment. Make sure the lift pot is not loose or bent and that the lever actually moves the pot a full stroke when lifting. If its not showing a fault code its most likely the pot has come loose or is bad. It hangs off under the dash and works off the lift lever linkage.

Look at that first

Its possible someone set max lift speed to a lower setting than desired. If you have a Zapi handset you can check it with that