That was interesting, Herb. I'd suggest the load needs to be re-shot, due to the consistency of 4 shots, 2 through 5, ie: 1 flier in a 6 shot group. The #6 shot could easily be a flier- ie; poor hold, etc.
What is more interesting is the consistency and velocity you got with the 100gr. Swiss 3F load and seemingly no fouling at the breech. The chrono readings are strange and nasty things happen when the sun if fierce and diffusers aren't wide enough to protect the 'eyes'. I've no explanation for the readings - just strange. for me, every one of those readings would be highly suspect.
The only Oehler chronograph I've used is my first one, a Model 12 or maybe 11. Since then, I've use only PACT and my Beta Master Chrony or is it the other way around?
By the looks of your testing, I'd be retesting the Swiss as well as 120gr. through 140gr. of 2F GOEX - maybe some 3f GOERX as well. Too, shooting more 5 shot groups with each load would give more reliable results.
That the 3f Swiss fouler is in the group looks promising, but could also be a fluke - such are the results of single groups, statistically. That time, it worked, with no guarantees.