As my son's score was just 2 points above the pass mark, I was/am a little concerned this might mean lower expectations of his performance. Hopefully his new grammar, like yours, will actually not take too much notice. We'll see!
I wouldn't worry, Waddle. SG mentioned at some opint that they don't take the 11+ results into consideration for targets because they are aware that pupils are coached inequally. They use a mix of KS2 results,IQ type tests and internal assessment, and adjust the targets regularly. I wouldn't think that Herschel is much different.