915is > 250 RPM drop on lane check

From new, my 915is had much more lane drop than my 912is. About 150-175rpm. My 912is was always pretty close to zero and I've hear the 915is should be the same. I am checking at 2500rpm (although 4000 rpm is only a bit better). Eventually it went over 250rpm and I've grounded it for now. I replaced the spark plugs, no change. I checked the logs with BUDS and did find a crank position sensor error and discovered that the engine cradle was making slight contact with the crank position sensor. I spaced that out and I am not seeing any more crank position sensor errors. Fuel pressure is perfect.

I was going to check the resistance of the ignition coils and spark plug wires. I see the procedure and the resistance values for the coils in the heavy maintenance manual but I cannot find the values for the spark plug wires.

Anybody know what they are supposed to be? Any other ideas for things I should check? Thanks.