You should be able to check the dome height with the piston at tdc and a flat edge laid across the top of the jug. Measure the clearance between at the middle and edge and take then away from eachother. Normal dome height is 3.7mm from memory.
Make sure you send them some really good samples too. Preferably with a single piece of solder. I sent 2 or 3 samples with some thinner strand twisted which they had trouble getting an accurate edge measurement on.. and I ended up having to send it back down for a re-work.
I also find it strange that you're fouling plugs. My first EC300 had something like 2.6mm clearance and while it was a pig to get running right, it never fouled a plug.
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