Roostn,
If you are truly only getting 2 inches of travel, then you have some mechanical problems.
As mentioned earlier, the right fork floats on the axle, allowing the forks to be aligned in parallel throughout the stroke.
Take the front wheel off, and make a guide that fits perfectly between the polished section of the forks. A 1/4 inch wooden or metal rod works best. Then install the front wheel leaving only the right side bolts loose. Insert your tool between the fork, running it through the spokes of the wheel, then tap the right fork in or out with a soft hammer to get the proper alignment, (btw - only hit the casting section of the fork)
If this does not resolve your problem, then you or someone needs to pull the fork apart to check into what may be occurring.
If you meant to imply that the bike feels so stiff that it seems like only 2 inches of travel are being used, then you'll want to consider re-valving the fork.
Oil height only effects what the bike does when the forks are at near or full compression. And you'll lose the integrity of the handling if you increase or decrease the fork viscosity. Stay with 5 weight.
And I can't imagine that both forks would have internal damage (unless someone has already worked on them). So you may want to remove the forks from the bike and press down on each fork by hand. You'll easily feel a difference if one fork is bad.
It not, then you may want to re-valve.
Re-valving a fork is as complicated as it is easy. After you understand the design of the fork and learn how to change it, you'll quickly learn that there's really little mystery to it. It's more trial by error than anything. I can help further with that if you need it.
Hope this helps.
DaveJ