The stringers are 12 ft. The largest gap is 5 ft from the front of the stringer. That gap is 3/4 inch.
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Sorry, but I have to ask.
Does it seem odd to you that the stringer surface isn't flat?
Normally (I've done about 20 or so stringer replacements) the new timber needs to be tapered about the last 6"in the rear to allow for the lap joints in the transom area and the front at the bow where the hull tapers up. If you have anything in between, I would question the straightness of the bottom.
How is it supported/blocked right now? It sounds spot on to me. Be sure to "bed" the new stringer in an epoxy putty or cab-o-sil and resin.
GT