Pinnacle is a great book, probably the best.
It makes sense that their lines jump so much.
1) Pinnacle is sharp, they're gonna move lines ASAP as action dictates. They're not gonna get screwed with a "bad" number.
2) Lots of people bet lots of money @ Pinnacle. This causes constant line fluctuation.
3) Most books deal -110. If they get a small amount of money on either side, they're still gonna deal -110. But if Pinnacle gets a small amount of money, they might move -107 to -105, -109, etc.