They prefer OD racing as far as I can tell.
We must allow ourselfs to overstate a 2 points difference under SCHRS (or Texel); is not a major difference. About 1 min 12 sec per hour. Now this may sound like alot but people often forget how quick time passes on the water.
Spitfire under Texel is about the same : 104 (spitfire) to 101 (F18)
Both system use very similar input values; I haven't investigates this in detail (as Texel is hiding their unrounded handicap numbers now) but it can be that Spitfire is again just on the right side of the rounding off boundery.
Wouter