Hmm.....with a ST angle of 71.5 degrees or less, most people wouldn't need a setback seat post, is your seat high enough? Your seat position should be relative to the BB in order to generate the best pedal stroke. If you need to get further back then I would suggest a setback seat post. Longer cranks would cause more pedal strikes. But, maybe you should look at getting a pro fit done.I have a new Mach 5.7 and my knee is a bit forward of the pedal axle with my seat as far back as possible.
Which would you recommend adjusting first? Longer cranks or a setback seat post?
I'm 6'1" riding a large frame.