If you really wanna do that (and you might), I'd push for
two extra days... minimum. You said it was a week shoot, so the extra $250 only comes to a puny extra $50 a day... which doesn't seem like nearly enough to even take care of off-the-clock overtime they are making you work.
If they want you badly enough, they will figure out how to pay it. If this is a legit production then that little bit of extra should be peanuts to them.
If not, then unless you just
really want that gig I'd just walk away and not feel bad about it... especially since an effective part of your previous "pay" was the education you received from the DP... who won't be around this time.
T2
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Todd Terry
Creative Director
Fantastic Plastic Entertainment, Inc.
fantasticplastic.com