3005 ran a 3/8" drop with 8" pneumatic wheels in an 8WD tank, WCD style config. Would not recommend that much drop
Originally we had a 1/4" drop (rev 1) and had some amp draw issues that were more associated with our gearing and construction quality, but were misdiagnosed as excessive scrub. The 3/8" drop certainly didn't hurt, but the rocking, especially on short/fast movements as the driver tried to make fine adjustments, wasn't great.
That was also on a lowbar robot, obviously the problem would have been magnified on a taller robot.