bike fitting-saddle to bar height

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got a sette razzo 2.o and am trying to dial in the same position i have on my giant anthem x. here is the question i thought proper saddle to height to bars was 1-3 inches below? my giant is probably an inch and a half below the saddle and feels pretty good. i tried to get that same measurement on the sette and i thought my teeth were going to touch the front wheel. i felt so low on the front it was crazy. sette feels good at at 1 inch above the saddle. any ideas on why something like this would happen?

also what is the proper way to measure the height. if i put a flat on my seat the pitch of the seat could change the number so what is a better method.

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anybody? shniggy maybe? you seem to be pretty well versed in knowing bike fitment and stuff like that.