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The diesel rabbit already has about as large of a battery as you will see in a compact car, I don't think there is space for a larger battery, but it's worth checking anyway.
Your engine doesn't have alot of electrical loads once it's started, of course starting the engine, with the glow plugs and the massive starter for the size of engine you have, can ask alot of a battery, so you do want to make sure it's charged up right away, but once it's been running for a few minutes I suspect that the load on the alternator is quite small, so making sure that the belt is not to tight, that the alternator spins freely and maybe installing a fan with lower drag is going to be your easiest option, like others have suggested installing a field winding cut off switch might help a little too but it also might shorten your battery life so you have to look at what the payback is.
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