Interesting! I am getting a custom made Boxy Plenum myself with short runners, velocity stacks etc (for a reason). Are you using a Plenum or just a cut-down inlet mani? You need the Plenum to cause the high volume of air & correct velocity issues (as far as content is concerned).

One thing I feel a need to add here for benefit of anyone mucking around with IM's etc: a poorly-built EM can cause both turbo heat/turbulence probs as well as engine damage. Better believe it! As for the IM. Enrichment probs are very likely due to poor design/fabrication. One area @ least to consider, as OP has touched on

I would have thought this suggestion by 300EVIL both viable & cost effective. I'm pretty sure my workshop is using the Rochy Injectors also. Maybe they are worth a try? Easy mod to do & you can sell off the other set to get some $$'s back surely?......know what I'd be doing.

I know this is concerning EM's but, I personally witnessed a very poorly designed turbo manifold ruin an engine. There was so much turbulence caused by a dodgy 'merge collector' fabricated. Instead of each runner meeting @ a given central point. They pointed @ each other directly, prior to merging down toward the cylinder head ports

P.S.

Jay, at least you aren't going to break any of the running gear with wheel spin. It's the gripping that will break a diff gear tooth/spline, housing, yoke, u-joint....whatever else takes up the slack Interestingly, when I choose the tyres for my beast on the 18's, I naturally want soft compound tyres, especially for wet driving but, if they slip, this equates to a softer pull on the drive chain & much less likelihood of breaking teeth

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um.....why have men got nipples