VTF= vertical tracking force
VTA= vertical tracking angle
changing tone arm height will change VTA, not VTF.
From your descripton, sounds like too much antiskate at first and then too little after you raised VTF. That makes sense geometrically. And antiskate would be mostly an issue at end of record. Mistracking will occur first in heavily modulated groove areas which will be consistently in the same place each time you play a certain LP and not present at all if the recordings were made at lower levels.
VTA= vertical tracking angle
changing tone arm height will change VTA, not VTF.
From your descripton, sounds like too much antiskate at first and then too little after you raised VTF. That makes sense geometrically. And antiskate would be mostly an issue at end of record. Mistracking will occur first in heavily modulated groove areas which will be consistently in the same place each time you play a certain LP and not present at all if the recordings were made at lower levels.