Miele WKG120 Twindos leaking intake

[radh]

Hi there, I have a similar issue to the one in this thread : Miele W570 leaking from water path seal between water inlet valve and mechanism behind dispenser - UK Washing Machine Repair Questions - Washing machine Forum

This is how the gasket looks after disconnecting it 

 

I took it off to clean it and applied the following silicon grease to both the contact areas; eg on the input side on the left, and around the outside of the rubber on the right. 
https://www.toolstation.com/arctic-hayes-silicone-grease/p52744
When I put it back together again, the rubber gasket slipped all the way back to the protrusion where the nozzle meets the valve attachment. When I slid the dispenser housing nozzle over the rubber gasket it no longer engages with the two stubs on the nozzle that indicate, I assume, how far the gasket should wrap around the end of the nozzle when seated correctly. 
Now, when I ran the cycle again, there was more of a clear leak here, but that was with the input stopcock fully open. When I turn the stopcock to almost close the input, it looks like the grease is doing the job, and I can't see any sign of a leak. 

Does anyone have any experience with the wkg120? It feels like either the gasket is too short for the distance between the input nozzle and the tray nozzle. Or, the input valve is somehow fitted slightly too far away from the dispenser tray housing.  I imagine my mistake was to fit the gasket back on to the input nozzle first, and then when I pushed the tray nozzle on, it pushed the gasket too far back on to the input nozzle. I might try disassembling again, and fitting the gasket snuggly to the tray nozzle first, and then sliding that assembly back over the small input nozzle.

I have ordered a new gasket so am hoping that, along with the lower water pressure will do the job. 

Any advice appreciated! 

(Trying to avoid a £250+ replacement of the whole dispenser housing, which I think isn't the actual cause of the leak; I had an local non meile engineer come out who simply found the leak and then didn't attempt to clean or re-sit the gasket)