Default [Q] MODEM Baseband ML1

I cannot figure out how to get AT&T 3g network speeds for GS3 (SCH-I535). I have tried flashing my modem via Safestrap, and still I get speeds of 11 - 14Kbps for upload and download. I have tried few option posted on XDA, youtube and other sites, but no luck. Currently modem is using the ML1 firmware.

I am running MOAR 9.0 TW via safestrap. Any guidance would greatly appreciated. Thanks.