I have the SERT and mine has been dyno-tuned and still pings when the weather gets hot. Cool late-nite rides, or cold days, runs perfect. Dealer said that he could not tune the pinging out completely. Unfortunately, I have started to just learn to live with it. My cousin in Carolina has an '07 Ultra Classic with the 96 cube motor and says his has never pinged since he's had it, guess it's just a big inch motor thing, that's what we get for spending the extra dough, a engine that gets hot and detonates when you accelerate.. 
Learning to live with pinging shouldn't be an option, IMO.
Took a trip west on a new, stock '07 Ultra in '06. Everything was great until somewhere around TX or NM. Started pinging rolling on starting up grades in 6th, downshifted to 5th. Over time it began pinging rolling on lightly in 6th OR 5th. Started paying attention to the effects of different gas and found I had less pinging using Sinclair than any other brand. I always use 93 octane back east, highest I found routinely west of TX was 91.
A guy at the party I was going to in CA writes for Hot Bike and had an '07 SEUC demo for the trip When he found out I was on an '07 the first thing out of his mouth was "does yours ping like crazy"? I said only out here in the land of crappy gas. On the return trip once I got east of NM the pinging stopped whether I was using 91 or 93 octane.
I've since swapped out the OEM ECM for a ThunderMax. When I experience very minor pinging only on the hottest of days I did a logged run and made note of the throttle position and RPMs where the pinging occured and took a few degrees out of the timing in those ranges. Not a ping since. I can't believe a dealer versed in tuning a SERT wouldn't try to take a few degrees of advance out of the timing in the areas where pinging is most prevelant. I assume the timing is adjustable on a SERT? I have no experience with that tuner....
TL