Hey, my yet unmet Amigo!
Besides the age of the original post, lean angle on a big-butt cruiser tis a subject near and dear to me.
For hooning the twisties, the Roadsters have poor lean angle. The newer 2.5 Rockets lean angle are greatly improved.
I found that installing the "Standard" boards increased the road height by an inch or more (depending upon shock settings) thus improving overall lean angle.
After installing the Standard boards, a taller 240/55R16 rear tire and a lower front tire, either a 175/40R17 or a 150/70R16 (same circumference) lean angle improved to 36°.
While not comparable to a sport bike, tis much better than most Cruisers.
Note: for me, lack of long daily ride comfort and storage eliminate the 2.5 as an acceptable cross country motor. Just sayin' . . . . .