Just to clarify, full spin is common sense, all the way down,No spin is the default spin, Middle of the ball, 3/4 spin is 3/4 way down the ball (from top, or preferably find halfway between no spin and full spin, then go a few fractions down again, but this is your to practice, as a few fractions up can send ball 5 or 7 yards longer, it comes with practice.
And as for tee's i add 2 or 3 yards, so Say i had 207 yard approach on tee, i use 210 iron full spin (205 yards) and its fine, but some tees seem to give you extra yardages sometimes and other times they dont. I dont know how many times i've used my 180 iron on Bethpage #8 (par #3) and its landed within 1 or 2 yards 1 time another its been 6 or 7 yards short for the same shot/same conditions!!