Track's fast, run-up's 200 feet...how is 1:35.28 the record at Del Mar?

I'm really surprised Del Mar hasn't had a mile race on Polytrack faster than 1:35.28 (set by Do It All, who won the Group II Zabeel Mile this year in Dubai). As Sunday's 1:59.54 Pacific Classic indicates, Del Mar can be plenty fast. Even around two two turns, 1:35 1/5 doesn't set the bar particularly high. And unlike for the track's other route distances on Polytrack, the mile distance is run with an extremely long run-up of 200 feet. The first quarter of the mile races is therefore usually very fast, as you would expect it to be. And unlike for Churchill's 6f races, which were listed as having a 100-foot run-up in the years before 2012, and a 180-foot run-up distance this year, that fast first quarter clearly aids the final time. I adjust the final times up on account of the run-up distance. Then after adjusting for the class of the races, they are still appearing in good light versus the mile-and-a-sixteenth races, even with the penalty I include for the long run-up distance. Also making the track record curious is that Del Mar breaks out mile races regularly -- frequently, even.

For there not to have been a mile faster than 1:35 1/5, the types of races being carded at a mile must be of low quality. It's interesting to me that a track can fall into not writing any good races at a certain distance, and probably without giving that a lot of thought. If there are no stakes at the Del Mar mile distance, though, or few, perhaps that is intentional to avoid the situation of the short run-up to the first turn. Come to think of it, maximizing the run to the first turn is probably the thinking behind the 200-foot run-up. But with 1:35.28 the record, I have to wonder how many allowances, and even how many maiden special weights and mid- and high-priced claimers, are even being written for a mile.