It's actually 9 degrees. I wrote that '5' is considered the normal angle according to the vet, and we are at -2 and +7!
Today I massaged both shoulders for the compensation patterns and found each one had fibrous tissue at the triceps, biceps and part of the delt muscle. As well, I found a particularly responsive spot way up at the rhomboids near the top of the shoulder/wither....that elicited very happy head nodding in ectasy.
The vet said the spaces between the bones looked good, the only thing was a small amount of vascularization (new blood vessels forming) at the medial sesamoid bone - but that blocked out ok anyway.
The vet suggested I go higher for another block (referred me to another vet out of town) along with ultrasound image. We've already gone as high as the knee, so I am taking Trinity's advice and letting things cool down and let the shoeing shifts
re-establish balance. Thanks for all your suggestions!