What bid system are you using to spend painstaking hours on? Shouldn't need more than 10 minutes absolute max, maybe little more on top two months. We only get 5 friggin choices most of the time FFS so what on earth are you doing, trying to be too specific maybe? Generic bids is the way to go....then unwind on the course or down the pub!
A mate of mine is forever bleating about roster satisfaction and getting nothing he bids for. Often in his bottom two months strangely enough......
Harry