Just double checking your picture from earlier... (and actually - my bad on the math, I keep on forgetting a factor of 2) if 15x8+36 is relatively flush for you at your current height. Then your "equivalents" would be...
15x7.5 +30
15x7.0 +23
15x6.5 +17
15x6.0 +11
So my earlier comment... should actually be... 15x7 +20 is equivalent to 15x8 +33
Edit: And damnit greasemonkey...you make me want to get 225s. I'll probably be content with some meaty 205's though on my 15x8 +25. Currently on BF GFSComp2 195's... only ones available at the time.