Harder starts after head installation

[SlowStang2]

O.k. if anyone has seen my previous topic, it was about a ticking I heard from a aluminum head installation, but with that came harder starting. I took it to a mechanic today who checked the battery, good, the alternator, good, the starter, it was apparently showing up on his computer as not operating right. He had the starter replaced, but it still starts hard. The starter makes a much slower wind noise than before the aluminum heads installation. When its hot, it takes about 6 seconds for the car to start. Should I be worried? What could this be? Would aluminum heads be effecting this? I tell you one thing, it sure is embarrassing. Thanx.

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94' Stang GT Convertible --Cobra upper&lower, GT-40Y Turbo Swirl aluminum heads, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s, Steeda Tri-Ax shifter, adjustable fuel regulator 14.4@100 MPH on G-tech;96 at track. (Sad, i know. This is with the stock heads)