Dear Slikric300: The cartridge manufacturer VTF advise range is where that cartridge perform at its best ( was designed for that ), out of those VTF limits degrade its performance: if it is lower than the low VTF limit the cartridge could skip on playing records/track and add a lot of tracking distortions to the sound reproduction and could damage your LPs, at the other side ( VTF up limit ) the sound performance suffer too a degradation but for other factors: when you set the VTF of a cartridge higher than its up limit the cartridge's suspension will work out of its limits making that increment the tracking distortion and that that suspension go out of work a lot before of what will be its " normal " life, that higher VTF could means too that the coild will be out of center and this fact is a sound reproduction heavy degradation, the higher VTF could damage your LP's too and the cartridge stylus.
There are other subjects about but IMHO you have to set the cartridge VTF as is the manufacturer advise if you have problems with what you are hearing with that >VTF then maybe the cartridge is out of specs and you have to look for dealer/manufacturer support.
Regards and enjoy the music.
Raul.