Please help solve my puzzle!

[JMBT]

Ok guys, here's the puzzle. Like many others on the forum my CM2250 has just started regening every 300 miles or so. 540,000 miles on the clock. No codes, and it just started doing this about a month ago. Virtually everything was replaced 86k ago. (DOC, DPF, Turbo, manifold, after treatment injector, DPF delta P and feeder tubes, Exhaust gas sensor, EGR delta P, EGR orifice pressure, and Map sensor), as well as the entire EGR tract was cleaned. All of that bought me about 80,000 trouble free miles. Woo-hoo. (Not impressed Cummins, not impressed)
My regens when forced with insite, perform flawlessly. There is never more then 1.8 diff pressure, and they always end with .18 diff and .52 outlet pressure. I have done the cylinder cutout, fuel leak down, and injector performance tests on insite and passed all with flying colors. I am not using any coolant, and use about 1.5 gallons of oil in 25,000 miles.
I went through the whole system today cleaning everything again and nothing was exceptionally dirty. The DPF looked fine, no cracks or soot on the outlet. No soot anywhere downstream of the filter. No deposits in the decomp. Everything looked great.
While disconnected from the after treatment I also performed a snap acceleration test and had barely a puff of soot that dissipated quickly, nothing excessive.
I did find one small exhaust leak on the back side of the flex tube, which I will get the part for tomorrow, but that is all an entire day of investigating turned up and I don't believe that is the only issue.
I have already looked into "other options" for if I can't figure this out, but I would prefer to figure out what the heck is going on.

WHAT AM I MISSING HERE GUYS!!! Please help if you know of anything.