Help! EVDO always switches to 1xRTT...

[kain144000]

Hey, Everyone,
I've got a problem that's been buggin' the h3ll outta me for some time now. First, I am running the latest WM6 (Sprint), radio v.1.27, and everything runs great (accept for once when all of my contacts were del'd somehow. 'Actually hap's to my g/f pretty often on her stock T-Mobile Wing. Any help w/ this'll be great, too, but anyway...). I understand EVDO is for data and 1xRTT for voice, sms, & WAP. I can have 5 bars EV signal, connect to Sprint (#777), and it'll switch to 1xRTT. My speed test show anywhere from ~40kbps to ~110kbps, nowhere near broadband speeds. I'd up'd the radio to v.1.43 and had to use IOTA all of the time w/ soft resets just to connect (a REAL PAIN IN THE @$$!!!), so then down'd to v.1.41, and the same. I then down'd to latest stock Sprint ROM (I know, eww ), but just for the radio v.1.27, then up'd back to the latest WM6. Sprint has absolutely nothin' to say (of course). Any help would be greatly appreciated, a GODSEND even.
Thanks.

Oh, yeah. I'm in NYC, so I KNOW there's fully functional EVDO rev.0 w/ rev.A some places. And, 'don't know if this'll help, but when I go from EV to 1x when I connect, and then run ##debug#, under the HDR page, "AN/AAA Authentication" usually reads "2 = Failed Authentication" ::shrug::