Tune
Start here:
https://ls1tech.com/forums/pcm-diagnostics-tuning/368718-read-me-best-ls1-tuning-software-best-scanner-best-handheld.html
Once you get your tuning software, you will want to get a Wideband O2 sensor.
WOT is easy to tune - your tuner all ready did that. Overall drivability is a whole different story. Once you get your part throttle tuning worked out, you can go back for a new WOT tune on the dyno. BTW - it's much cheaper to rent a dyno for you to tune than to pay someone else to do it.

