Have you tried cleaning out the gap between the bodywork and the bumper where the two meet at the bottom lip of the boot aperture? I've had a similar issue with mine - ended up being the seal fitted the wrong way round. Water should run down the aperture surround and then down the gap between the bumper and bodywork. If that's got gummed up with leaf and road debris, then the water's going to pool there and then capillary action will get to work. Also, if the bumper's been nudged in slightly, then the gap could be a bit tight. It's worth a look.
Alternatively, you could pipe in a bead of silicone sealant along the aperture lip prior to refitting the seal.
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