Brian, I tend to use tuck into the tree with the deck and then back up technique to get close...kinda like a bunch of k-turns. If I don't rush, there's little or no turf damage and I can get darn close in most cases. The issue with circling at the extremes of steering, regardless of machine type, is the outer anti-scalp guides sometimes digging in and causing a visible circle in addition to any drive wheel damage from a tight turn. This risk is reduced if you're cutting at 4" or similar, but increased the shorter you prefer to cut. I run 3.5" normally and sometimes 4" in the spring.
--
The most expensive tool is the one you buy "cheaply" and often...