Reed settings on V-Force?

You have it right - low tension for an added hit off the bottom and high tension for an added hit off the top. Just be careful, if you choose low tension, the reed pedals open more often/easier/more and they will wear faster. So I would inspect your reeds every 4-6 months if you go with low tension for chips/bowing/wear.

Other things that help bottom end:
1. drop the CS sprocket one tooth from stock.
2. Be sure your pilot and needle circuits are jetted correctly, not just the main.
3. swap the rev pipe for a woods pipe
4. If swapping is not feasable, install a Fredette torque ring.
5. Install a flywheel weight.
I assume here you have done the standard airbox, et al mods already.
My V-Force reeds on my 220 are on the low setting and with the other mods I have listed, the bike is a tractor. I really have to work at stalling it out now and have power from idle on up without hesitation or bog. I also don't need to slip the clutch as often to keep the revs up to where the power is enough to pull me over things.
If you are going from stock reeds and are currently happy with your jetting, you may find that the V-Force will cause the bike to run richer due to the reeds flexing more and allowing more fuel in at lower rpm's. It is usually a good idea to change one thing at a time and check jetting after each performance change.

And finally: Try your bike with reeds in both positions. That is the only way you will KNOW what works best for you.