WIFI consulting in NYC to tweak our network

Hi are there any reccomended wifi consultents/engineers that people use?

We have Extreme Network WIFI 4511 ap's in place throughout the 2 floors of the facility,about 14 in total, as 6 are in audio suites.

Connected to a Extreme 450e Poe switch, we have a 100mb dedicated internet line, which is also shared with the wired facility.

Minimum number of clients is around 85.

We are runninginto various issues especially when busy, with clients unable to connect or being rejected.

We have limited client loads, and have smart RF on , however we still seem to get problems and warnings.

We would like a "specialist" to come in and help teak what we have to operate a lot smoother.

Any reccomendations appreciated.

Thanks

Brian