If you dyno it with a 1050, and he said you needed a colder plug, then went with colder plug then change to a 850. You probably dropped a good 30 hp and now that colder plug may need a hotter plug. Because it changes the air to fuel ratio. Only way to really tell is to make a run, shut it off and pull plugs and see what they look like. If you can take a picture of the plug I can tell you right away if it to cold can also tell if its got enough timing. I’m curious why did you take the 1050 off and put 850 on.
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