cutting out at low speeds

Hello i have a pointy 07 with 10,000 miles now on clock. Being having trouble of late with sudden cut out at low speeds. I have just replaced the air filter and a bike mechanic adjusted the tick over, before i put the filter in. The tick over is not staying constant even on a mild morning start and when it is warmed up. Seems to like the slow down point at junctions, to cut out! Being through the winter so lots of rain and general road salt. I had the same trouble at 7000 miles and the bike shop got it right second time around. IT is at times staying around where the mechanic set the tick over, but if left it sharpy drops off. Any advice would be welcome. I know v twins are temperamental, but this is silly. If it was a cx 500 i would know now to fix it . A point in the right direction before i get silly and start getting tools out would be great .
thanks ged

Am I right in assuming that you are setting the idle after the engine has been warmed up, and not from cold?

(If the idle is set from cold, then when the engine warms up it will sink to a lower value.
Best way of setting the idle is to go out for a 30 min spin, and then while the engine is still running, adjust the idle then. That should keep the idle spot on for at least 6 months before it starts to wonder again.)

will try this first! Thanks

Simple solution, don't ride at low speed - it works for me.