Looks like some kind of conflict with the dock bar to me, but I really don't have a clue what the cause is. Have you tried using a different launcher or dock bar yet ?, that might help. Apart from that I think you have the right idea with the columns and rows, mine is set at max, I think it's 9x9. One last thing I can think of (which probably will not help) is if you long press on the widget and go to 'edit' you can resize some stuff by dragging the border that appears. This has not worked for me yet with any widgets, but it looks as if it will stop other widgets using space you have designated to a certain widget. Like I said though It's probably not much use !
It was definitely the dock bar. I can't use the "None (expanded desktop)" option. I use one of the other options (1 icon), then set a gesture to swipe down to hide/un-hide the 3d dock bar. That way if it disappears I can just swipe down to get it back. The icons and widgets for ADW Launcher EX only look good in 8x6 so I'm keeping it there. Everything else seems to be going ok. Dolphin HD hasn't crashed lately so I'm happy with that. However, the tablet has restarted on me twice for no reason (it was just sitting there). I'm still having trouble finding good tablet apps. The phone apps are driving me nuts. I also discovered that the XfinityTV website won't play videos from Hulu, which is a real bummer.