Calculating optimal pressure for the kegerator

I bought a Haier kegerator along with a 2 tap tower and I'm trying to calculate the optimal pressure for this set up, using the formula at http://kegman.net/balance.html.

In my system the height from the center of the keg to the faucet is 2.5 feet and the length of the beer line from the faucet to the end is 5.5 feet (it's a 3/16" line). Example 2 on that page, though, uses the length of the beer line form the faucet to the center of the keg. In my case, wouldn't it be the same as the height mentioned earlier?

Other formulas I've seen just use the total length of the beer line. So, in my case, the pressure should be 5.5 ft * 2.7 psi/ft resistance + 2.5 ft * 0.5 = 16.1 psi.

I'm trying to calibrate it, because it's still foaming at 12 psi. I might have overcarbonated it a bit (while force carbing), but I just want to make sure my calculations are correct.

This is all I've ever used: http://www.zahmnagel.com/LinkClick.aspx?fileticket=HuVGZ8tLaow=&tabid=77
All this center to keg and elevation above sea level business just isn't worth the hassle IMHO. It is beer not some delicate combination of gasses that will keep space shuttle astronauts alive upon reentry.

However depending on what method you used to force carbonate you may have over carbonated. Fix that first. If you carbed by shaking, remember you can release co2 from the keg and shake to go the other way.