There needs to be 4mm of clearance from the base to the "ceiling" of the block. If I read what you're saying, you intend to push the nozzle further up the inlet, but the distance from the base to the ceiling of the block will still be 2mm? You will want true 4mm of clearance over about a 25mm diameter circle around the nozzle.
Again, just my thoughts, maybe not fact.
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