There is a drain plug on the bottom of the fork, although I haven't been able to remove mine without damaging it, you can also drain the fork oil by removing the cap on top then removing the forks and drain the oil them. Do not remove the cap with weight on the front wheel. This is the method I use. You can possibly go to a thicker fork oil. Porgressive suspension makes after market springs for both the front and rear of the vstar. The rear shock spring is basicly the same as a Roadstar spring. Might be something to look into.
Hope this helps.
Doug
Hope this helps.
Doug