No, not at all. Every time a filter is added, the overall level as measured by band limited pink noise will change. You do indeed need to recalibrate. Only takes a second though.
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how many db on each side of the target is considered acceptable
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Depends. If you have a narrow spike, then you usually leave it alone because you won't hear it. If you have a wide peak, then you can usually let it go when it gets around 3dB. It all depends on the frequency and the bandwidth of the peak.
Post your graph and we'll let you know.... use a vertical from 45dB to 105dB and a horizontal from 15Hz to 200Hz.....
brucek