Yep, contracting out reduces your state pension, my wife (30 years civil servant) is in a worse position than me.
I am busy fighting HMRC over my 'stamp' not being paid due to incorrect advice from one of their officers at the moment; however, having left at 38, it looks like I need 22 years of 'normal' NI contributions to get up to the full £155. Their website shows me 6 years short and standing at £133 currently.