EteSelle, here is something from drmirkin.com on salt and blood pressure. http://www.drmirkin.com/archive/7095.html
If you go on his site and go to the search you might find other things on salt and blood pressure. He gives references for what he writes so you might want to check them out.
My own blood pressure is a mystery to me. I have a wrist cuff and the systolic is pretty accurate but I think the diastolic is about 10 points lower than the reading I get at the dentist's (I always request they take my blood pressure and I go 4 times a year) Just now it read 119/58 and you can see that the pulse pressure would still be high even if the diastolic were 68. For a few days the systolic was 165. I, like you cannot figure this out. I do not use the salt shaker but do use honey mustard with salt and chipotle hot sauce and am not as religious as you about no salt. Maybe I should try Dr. Mirkin's information about too low salt in the diet. The last time I was at the dentist it was 128/70 but she did not use the wide cuff and I had just sat down and did not do the 10 minute rest thing so I think the systolic would even be lower.
You don't have white coat hypertension do you?