Plug doesnt really look anything particuarly unusual, one issue with plug chops, is unless you shut the engine off instantly while you are on the gas, often they change colour again slightly after your run as you come to a stop sadly!

High 10s on gas is nothing alarming AFR wise, as you say, can be a bit of a minefield on nitrous.

Doesnt matter how many injection points you have as to wether or not you can run a controller.