Isolater - There is no score in your history at 85. There are no 7 or 8 scores at Oakmont in a row ANYWHERE in your history, never mind 7 or 8 in mid-high 70's
Oakmont back 9 score 35 (70) 02/19/2011
Oakmont back 9 score 41 (82) 02/19/2011
Oakmont full 18 score 69 02/23/2011
Oakmont full 18 score 68 02/25/2011
Oakmont full 18 score 70 02/28/2011
Oakmont front 9 multiround: score 37 (74) 02/28/2011
Oakmont full 18: score 74 03/02/2011
Oakmont back 9 multiround: score 34 (68) 03/04/2011
Thats your last 8 Oakmont scores - 5 of them at 70 or below...two in low/mid 70's, and one in the 80's .... most of them with a few games at Kiawah/St Andys in between (mostly mid 60's scores). These Oakmont scores are NOT bringing your average down, they just aren't bringing it UP. The low/mid 60 scores are what brings it down...
HD - I wouldn't worry, you won't be promoted to tour master on your scoring...just keep shooting as you are and you will remain around 66 average - as you don't hit TM till you go down to 63, you have some improvements to make before you make TM (as I do)