Any chance you have a small leak on the suction side of the pump? It may not drop fuel, but will draw air, like trying to drink through a straw with a hole. A small one may only draw air at high flow rate, like you're seeing. 
BTW, stock pump (large) and lines(3/8") have proven adequate for me thus far.
Stu
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"Having a 10 second Civic must be just like coming out of the closet; you'll surprise some people, but you're still gay"
1970 GTO, 455+.034", 0 deck, Wiseco's, Eagle rods, 60919, Rhoads, E-Heads, 1.65 Scorpions, RPM, Custom Qjet by Cliff, Doug's 1 7/8", THM 400, Gear Vendors OD, 3.55s.........Her name is Blandorf; after a girl I knew once, 'cause she's just Bitchin, always.
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