Ok, you said you went topside and checked the drip tray and drain lip, they are clear.. did you check to insure the water is driping INSIDE the A/C and not running in off the roof (Easy way, Dump a bucket of water all around the A/C tossing toward the A/C and when A/C is not running
if water is dripping inside three options
As someone suggested raise the front an inch or two.. This makes the front lip higher and just an inch or two won't bother the fridge.
Two: Clean the intake filters (alsao suggested avove) as if they get dirty the blower will such water out of the tray into the area in front of the condenser and then when the fan shuts down NIAGRA FALLS, it may drip for a while before that.
Finally. Cracked drip tray. Repair or replace. (Foxy-Poxy, and underwater epoxy designed for use on swimming pools MIGHT work.