the 2c-b combination sounds incredible.
This was one of D.M. Turners favorite combinations in his book 'The Essential Psychedelic Guide'
I hope I get the chance to experience it one day.
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I would agree ipu. dissos + tryptamines mesh incredibly well, tryptamines are far superior. But 2c-b has received the most praise out of the family. And I think its worth much more then it seems. (besides mescaline, Although I don't picture mescaline and dissociation being particularly pleasing.)
I doubt its any better then the combination with DMT. Though.
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Cloud, washing is not enough. Make sure its at least triple RECRYSTALLIZED fumarate salt. Then you can wash it and dry it with cold, dry, USP grade acetone.
And above all! Use a 0.2um whatman filter. <-- This is the single most important piece of advice I can give you.
My standard hole dose of ketamine was around yours cloud, seems like you have a bit of a tolerance

I would use, give or take. 75mg of dmt fumarate per IM shot.
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Be prepared, you must have a trip sitter. The first time I did this combination I was vocalizing very loudly, and looked like I should have been in a strap-jacket in a mental institution. However, This is pretty natural with dissociative use. :d
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On my last note, ive seen an abscess before. Not myself, thankfully. But it is quite horrible. Its all in the odds.. I mean even in a hospital setting with proper sterilization and equipment. Patients have contracted abscesses.
Realize the odds are less and less in your favor when you take this risk.
Use this opportunity to reduce the chance of inflicting harm on your body.