Don't forget that Lingfield hosts 20+ essentially turf meetings during the summer, as well as mainly turf with one or two AW races, i.e. mixed surface meetings. That would throw out your curve for the number of AW meetings. For example, next year the course is down for 85 fixtures, a quarter of which will not be wholly on the AW, and, of those which are on the AW, many will be for 2 y.o.'s (nurseries, not handicaps) and 3 y.o. maidens (no proven track record).
The track is harrowed quite heavily in the winter, due to frosts and snow, and it is now actually quite old - in fact, it really is due to for a new surface - as against in 2005, when it had a little more spring in its rubbery step! I'm not sure which year they actually flipped the surface right over (maybe 2007) but that would also have had a slight impact on the feel of the surface, making it run a little softer, as the old top surface had become quite compacted.
So, instead of presenting a standard equivalent of Good, and while pretty much all AW tracks are called 'Standard' on any day of the year, there have been subtle differences over the past few years. Just like Wolverhampton was hurling up divots the size of cricket balls a few months ago, but is now calmed down by finer harrowing, so Lingfield hasn't presented a totally standard 'Standard' for some time.
That probably doesn't help you in the slightest!