A long shot but...
Had what I guess was the new/current tune installed back in late February '12 and it went fairly well with little use until a trip across France into Germany and back (~2300 miles). At my first refuel I thought I'd treat myself to the tank of 98 octane. For the rest of the day, every time I stopped it boiled over. The weather wasn't particularly hot and I was never doing much faster than cruising at 55mph tops. Stops were usually preceded by a trundle along at 31mph.
I stuck to the local 95 octane and boil overs reduced but never really went away, just one a day. Generally the 30/50kmh bits always seemed to raise the temperature while I was having the wear my inner jacket to stay warm and the running was a bit ragged at the lower speeds.
One thing did surprise me was how well the Tiger ran on the 95 - E10 fuel and how this tended to reduce the boil ups. Not really sure what the E10 bit meant but thought it was 10% ethanol but it seem to also solve the boil ups.