dovetail depth

I use a Rockler dovetail jig. For my drawers I use 5/8" stock. I would like to make my tail height half the thickness of the wall thickness (5/8") but cannot. The tail height seems to be fixed based on the jig instructions. The starting-point suggestion results in tails about 1/4" which gets...

Can anyone tell me how I determine how deep to cut when using 1/2" stock to make half blind joints:wacko:? My first attempt with 3/4" stock to make a half blind joint worked great! The only problem is I plan on using 1/2" for all four pieces of the drawer.