Hey Norcal,
I know the feeling of PCGS not crossing my coins. Sometimes you have more success if you crack out the coin and submit it raw. I had a 1912
Liberty nickel graded "MS64 PQ" by PCI which I cracked and submitted and PCGS did put it in an MS64 slab.
Your coin appears to deserve a high MS grade, but it does have a very flat strike. This is pretty common for S and D-mint Buffalos, but Philadelphia coins are usually sharper. TPGs generally downgrade for weak strikes, so maybe that is why yours didn't cross.