35 sec. is relatively long time in a nose down possition before the plane hits the deck.lol
i know it saids to make the intake line as short as possiable.

But on my nitro cars or trucks, those lines are almost a foot sometimes.

makesure there's not kinks in those brass tubing.
You might also consider installing those metal fittings with a larger ID.
Plus the filter you have on is contricting fuel flow.