"consumer tubulars" have butyl tubes.
Team issue race tubulars, Competition, tempo, Sonderclass have latex tubes.
This is, at best, a half-truth. Most of the team issue Continental tubular tyres ("Pro Limited" and friends) habe butyl tubes. These tyres are finely tuned to special applications. Continental's researchers believe that (their) properly formulated butyl tubes are superior to latex. The standard competitions (and ProLtd) get a very thin buytl inner-tube ( 0.4 mm).
In order to, however, meet the wishes of some riders (and their mechanics) Continental also make some of these tyres with latex.
There is a difference in the ride and also unsurprisingly in the air retention time .
Have you really compared ProLtd latex with ProLtd (non-latex) designed for the same event?