Whatever works:

Long stocks work PRE-MOUNTED

Kimberly Rhode with her old Perazzi



Possibly Capt. Money



'3 fingers' stock; Richard Faulds at the 2008 Olympics



Derek Burnett - Ireland at the 2012 London Olympics, Men's Trap



Crawling the stock with nose touching thumb; Dr John Truitt at The Southern



Head position matters a great deal



Interesting stuff here
https://docs.google.com/document/d/1c7UkkNyMTZ9NAztILpzjSLKvgIneAw5i7eqkZ3d3Eno/preview

I'm a 6' 2", 175# long pencil neck geek and wear 16X35 dress shirts and shoot best LOW GUN crawling a 14 1/2" LOP stock.
I very much agree with trying a slip on pad for awhile before altering your stock/purchasing a custom stock.




https://sites.google.com/a/damascusknowledge.com/www/home