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The real objective in determining what your golf club Lie & Length should be is to get as many 'On-Center' hits as poosible. Whenever this is reached, you have the best Lie and Length combination for you.
Simply translated this means you should be hitting the golf ball with the center of the clubface, which by necessity means the center of the sole as well.
Do yourself a big favor, and do what a clubfitter will do for you, since apparently you don't think that visit well-advised, and buy some impact labels, both for the clubface and club sole. You can use the Face impact tape both at the range and on the golf course. Find out for sure what is actually happening rather that simply guessing!
You should also take the time and energy to find out what the 'True' Lofts and Lies are for your clubs by getting them measured on a Loft & Lie guage. Again this is a service the a good clubfitter would do for you.
At 5'11", you aren't very tall by today's 'standards'at all. The 'Big 5' are all from 2" - 6" taller than you. Further, keep in mind that a 1* change in Lie = 1/2" change in Length, based on the commonly used Swingweight equation.
The biggest purchase you should make is to invest in Tom Wishon's book 'The Search For The Perfect Golf Club' available online from his website or through Amazon. Read it!

Ed Goodwin