OK, I'm a little dense. Can you explane in english how you can get to 15 in straight pool and be able to run 19 racks. Heck, even if a guy plays a safety and you rack 15 or there are 15 on the table, then you only run 14 unless there is some new science out there.
I'll try.
The usual situation at 14.1/straight pool is that you start with 15 object balls on the table, run 14 of them off leaving yourself a nice shot on the 15th ball and then rack up the 14 with the head ball missing, and shoot that 15th ball and break open the rack to continue the run.
Sometimes when pocketing the 14th ball of a rack you also pocket the 15th ball on the same shot. In that case you get a point for the 15th ball, all 15 rack up and if you want to continue the run you have to call ball and pocket for some ball in the full rack.
There are perhaps a dozen fairly well known shots that can be played out of a full rack of 15 balls and a similar number you can play from a 14-ball rack. I was once playing a doubles match and twice during the match my partner called and made a ball from an unbroken rack.