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Forget variable injectors, they are not available for MB's. Injectors do not affect IP timing, only the timing chain & IP placement do that. However, inejctors have a spring inside with a precision spacer that sets the "pop" pressure of the injector. Each of your 5 (or 6?) injectors need to have the same "pop" pressure, within about 3 bar preferably (spec for turbo engines is 135 bar I believe). If you install an injector with a significantly different setting than the others, you will have a rough idle. You can't do this yourself, a diesel shop with an injector tester & shim assortment is required. Or you can buy a used pop tester for ~$200. You might get lucky and get one that bolts in & works fine out of the box, you never know. It's still VERY strange to have a leak between injector sections, there is bascially no "seal" between them, you would have to have a damaged or severely worn body to cause this. I still think your problem is something else, like the return lines, or the two sections not being tightened together...
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