I'd try changing back to the previous ignition components.
You may think that I'm making the following comments just to try and sell you our products but these are FACTS;
1) 99% of ALL US brand nitrous products are GARBAGE, especially the plates and especially perimeter plates.
2) The reason they are GARBAGE, is because NONE of the people involved in those companies understand the first thing about nitrous FLOW.
3) Due to lack of understanding they fail to offer products that deliver EVEN distribution.
4) The ONLY US brand plate that delivers nitrous and fuel 'close' to EQUALLY to all cylinders, is the Speedtech plate;
http://www.speedtech-nitrous.com/diffus ... stems.htmlThe reason it is better than the others is because it fires nitrous from the centre of the plate. The reason it fails to deliver perfectly even, is because it only has a single feed.
5) The ONLY plates in the world that are GUARANTEED to deliver PERFECT distribution are our Spiders and Killer Scorpion plates;
http://www.noswizard.com/nitrous-ancill ... -4500.htmlhttp://www.noswizard.com/nitrous-ancill ... plate.html6) The reasons our plates deliver PERFECT distribution, is because they fire nitrous from the centre AND because they have TWIN feeds.
7) The reason perimeter plates CAUSE UNEVEN distribution, is because nitrous has MASS AND HIGH LEVELS OF INERTIA, which means the flow MUST be 'MANAGED', in a way that takes those factors into account and US companies aren't even aware that these factors exist, never mind how they should 'manage' the flow to achieve perfect distribution.
Now most people think a bit of uneven distribution isn't a problem and that is correct on SMALL levels of nitrous flow but as you ramp up the flow it becomes more and more important, as a small imbalance at say 100 HP will have a very small percentage effect on the total induction flow and that obviously increases as you flow more.
If I was looking to buy a nitrous plate, the VERY LAST type I would buy is a PERIMETER type for all the above reasons.
By the way I've taken a very close look at your nitrous kit/installation and there are a number of things I would advise you to improve, if you were using my products but as they are American products it's not possible to do so.