Saddle height confusion

Milesalex

Dirt Disciple
Hello

I’m looking for some advise regarding saddle height. I had a custom Paul Hewitt Alpine frameset made 15 years ago which I still use today and is my favourite road bike.
I am 5’9” tall with a 31” inside leg, when Paul did the bike fit I got a drawing showing all the dimensions of the frame and the saddle height is 733mm to BB. I have always set it at this height with no problems.
But when I calculate myself using the various formulas its more like 700mm, how could this be so different. I have regular limb / torso length however I do have shortish arms which is why the head tube is a bit longer than stock.
It’s always bugged me and I’m even thinking of having another bike fit.

Would appreciate any advise.

Cheers in advance.
 

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