Limit on AAL's ? 2007 LB Advice Wanted

So I currently have the deaver 1.5-2 in Add-a-leaf in the rear along with Bilstein's in the front ( http://www.headstrongoffroad.com/store/p452/HS_Coil/Bilstein_5100_kit.html ) with some other upgrades. The front is adjustable in lift height and I currently have it set to the bottom for the best ride, with the long bed tacoma the 2 and a half inches just doesn't look like as much of a lift as I would like and I am thinking of adjusting the front bilsteins up a notch to get a slightly higher lift. Obviously I don't want to be higher in the front so I am curious what my options are for lifting another 0.5-1 in in the rear. Can I simply add another leaf in the rear? What would you guys suggest.