CB, even the firm fixed price contracts usually have wiggle room when they are that size and when they get going they "relook" etc. etc. and somehow come out ok.
We struggle with this constantly, one thing is how you read the wage grade job descriptions and how they apply. Some contractors just flat do not care about them, pay their guys what the guys will work for, and hope not to be caught. Sometimes they could be using a different wage grade then you would even think had anything to do with it, maybe he decided that instead of an "Mulching equipment operator III" (I am making stuff up that seems obvious to you that is what your guys are, he bid it to pay as landscape worker -4 who pays money for the joys of being here working. I have seen this get real screwy (PM me to hear the back story on my employment)
Last one I bid that drove me about nuts, 5 of us bid, 3 of us, all know each other, bid against each other fairly regularly, 76K, 77k, 78k I think I was middle, the difference was slight pencil sharpening here or there, another out of towner took a flyer at 126 I think it was and the guy that got the contract got it at 33K. Still upsets me when I think about it.
I still do not know how they got by with it, but they did not do what was in the contract (yes, I watched closely) but they still got paid, plus I believe they got some change orders through.
I guess at this point I am just ranting but if you ever do figure it out, let me know.
Last contract I was on for the previous 17 years or so, the company I work for lost. Was told, and I believe it that the winning company one with a bid with 1% profit. (multi million dollar contract) but still 1% is a mighty, mighty narrow margin. Rumor has it that same company got the contract I am working now as well
Another deal at times is to do substandard work, say it is done, then argue to get paid, or go in and do the cream, get paid and roll out on the difficult stuff and declare bankruptcy, put another letter on your sign, bid higher on the rebid. I have seen that happen so much it makes me truly sick, then have contracting explain to me that "they are a different company" and I am pointing out that the letters stuck on thier truck sign are peeling off showing the old company name still and the same guy is driving the same truck and they "won" the contract to fix the building that "they" had built. Urrrghghhhhg
Let me know if you sort it out.