Unfortunately, unless there's a CEL or an actual problem, I don't think taking it to the dealer is going to accomplish anything at all. Technically, you're not even supposed to know when regens are happening. It's only the few CTD owners out there with a Scan Gauge or some other kind of gauge that even realize it.
Honestly, I think a lot of factors go into how often it regens: atmospheric conditions, fuel quality, driving conditions between regens (short vs. long distance), driving conditions during the last regen (did it get a good burn?).
Just in the last three months, I've had regens as close as 80 miles between each other, and with little variation in driving conditions, others that were almost 700 miles apart - almost all short distance driving in all of these scenarios. In December and the first week of January, I had two regens where the soot mass dropped all the way to three and barely climbed for the next two weeks of driving, but on my last one, it burned all the way down to 3 STM, and within 10 miles of freeway driving after it completed it was all the way back up to 17 grams, but took 100 miles or more to complete the last 5 grams (mine always starts at 22 or just prior to it). I've had regens take 30 miles of solids 70 mph freeway driving to go from 22 to 3 grams, and others do a supposed complete regen in just 10 miles of driving around town with frequently slowing and stopping.
I haven't been able to pin down what causes all the variation, but so far, I haven't had any actual problems despite countless interrupted regens, so I'm going to keep crossing my fingers and hope all is well in the end.
FYI, I've had 90 completed regens in about 33,000 miles. The first 8,000 miles were nearly all long-distance, but then our commuting situation changed, and it's almost all short distance now with only a ten mile commute to work.