Which engine, transmission, wheels/tires, etc were you running? Try to get a lot more track time with exactly what you have now so you can get the most important modification taken care of (the driver).
Actually lower temps give you an advantage at the drag strip. I remember each time as the ambient temp would go from the upper to mid 70's F to low 50's or even the 40's over the course of a few hours my trap speed would increase (and ET's would decrease), telling me my motor was making more power with lower temps. Street summer tires don't really seem to have a lot of straightline traction on the strip even on a warm day (I can chirp into 3rd gear at both tracks, but almost never on the street).