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to be completely honest, when your car is at WOT, you will have little indication of whether you are fueling adequately or not. At WOT you are open loop and the ecu no longer runs at stoichiometric so the 02 sensors are no longer providing feedback. you could be running lean (fuel system not keeping up) and not know it. especially since this is when the highest demand is placed on the fueling system. aftermarket tune will only help with this if it is in-person (ie, not an out of the box solution like softronic or pedro). perhaps track your timing at WOT to see if the ecu is pulling any time due to excessive detonation from hot running. otherwise, the only way you are going to know is with a wideband o2 sensor.
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