According to the manual there is no lift adjustment. However, also according to the manual, there should be no need for one! VTA is adjusted by raising/lowering the entire arm base including the lift. So whatever lift there is remains constant.
From all the way down to all the way up you should have something like about 1cm of lift. Check and if that is not the case then your lift is off. If you do have about 1cm of lift then it is something else, most likely your VTA is adjusted way too low.
I would try raising it up a little at a time, listen to how it sounds, and as long as you hear improvement continue raising. This is the correct way to do it anyway, VTA should always be set by ear. Any advice about parallel arm tube or cartridge or whatever is merely intended as a first approximation. Fine tuning is always done by ear.