Toto Drake does not fill the bowl to the level of other same toilet. Water level in bowl is low.

most of these have a screw adjustment on the fill assembly inside the tank...screw up or down to adjust....try one way or other to see which works

Replace the assembly. This is common in areas with high mineral content in water. You will be glad you did. Delay too long, you may find your toilet running while you are at work .

2 possibilities.1. The water level is set higher the the overflow tube. This will cause the water to run into the overflow continuously. You should be able to see this. 2. The large seal - bottom center of the tank - is leaking. This will cause the water level to slowly drop after a fill. The water tank will start to run again after flushing - BUT NOT CONTINUOUSLY. You should see if there is a small amount of water flowing from the rim to the bowl 15 seconds after the water has stopped running after a flush.

The bowl is cracked and is leaking down the drain. You will have to replace it. It may have cracked if the bowl hold-down bolts were overtightened, or the bowl was not able to sit flush (pardon the pun) on the floor. If the bowl rocks when it is first installed, instead of tightening the hold-down bolts, use a couple of tapered shims under the edge of it, then caulk to fill the gap and hide the shims.
Good luck.

Make sure the fill tube in the tank from the fill valve is in the overflow tibe inside tank. The tube allows bowl to fill with water to correct level.

The small tube that comes from the Korky fill valve needs to go down the center of the tube in the tank. It should have come with a clip to clip it inside the fill tube. If the tube is running water into the tank it is just filling up the tank, not the bowl. The tank is filled with the Korky valve from the top of the tower, not the black hose. See the video below to see the black tube I'm referring to and where it should be attached.

http://www.youtube.com/watch?v=bfE8gBV0gHI&feature=player_profilepage#t=92s

Is it not refilling the tank or the bowl? I've got a toto also that is not fully refilling the bowl after each flush. No leaks or other problems. Tank refills fine. Seems that the flapper doesn't float long enough to allow a sufficient amount of water to drain into the bowl before closing. Any ideas?

Defective fill valve contact Toto for a free replacement part

You will have to use ToTo OEM replacement parts. If the water is going over the overflow pipe, the fill valve washer will need to be replaced. If the water is running into the bowl and not over the overflow, the flapper will need to be replaced.

Problem solved.  Reason was a totally blocked waste line that resulted in toilet malfunction.  Toilet functions normally now with removal of blockage.