Whats the deal with this chip?

[90dpscoupe]

Well luckily i didnt drop 2 bills for a new one, it was free, but how come i got no improvement, i did back my timing off to 12 from 14, i figured i'd get at least 2 mph, someone said, i think 95gt said these chips require using (no) cat cvrtrs? is this maybe why i see no improvement, actualy i think it hurt me, but it was severely humid when i ran, best was 14.0@97, should i bump the timing a bit more? or just get rid of the chip all together? anyone ??

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90 lx coupe: Mac cold air fenderwell, accel supercoil,ADS chip (not yet track tested),3-core radiatr, FMS alum D/S, Black magic fan, 3.27grs, 3chbr flows.
Best time: 13.9116(on 225/60/15 firehawks)
Best mph: 98.17
Best 60': 1.9607

next mods: subframes, mac h-pipe