Awesome, it is perfect now, that you have diff. payments and sigs for each position, even the pay per post is attractive. BTW you will have to contact escrows not the other way around, and there are many free escrows around too, I would say sebastianju's escrow, his escrow is free too. Here is a list of all the escrows, try contacting them thru PM
https://bitcointalk.org/index.php?topic=108716.0P.S maybe remove this sentence from OP as you now accept people with negative trust.
Note: Removal of signature at any time during campaign will result in disqualification. Also we will not accept participants with negative trust.