Sprint Touch Pro on Verizon stopped working - help

[mitpianoman]

I bought my phone off of Craigslist around 6 months ago and someone had already done most of the "heavy lifting" for me when it comes to getting this Sprint-branded phone working on VZW. I only had to do *228, option 3, and update my PRL to get it working on my account. Everything worked fine. I've since flashed to a couple different roms found here and have generally had success until recently. Following the directions, I do a hard reset (always by going to settings -> system -> clear storage) then allow customizations to run. No problems there.

Recently, I read some bad advice that I could also perform a hard reset through the "Reset" option in EPST. Resetting in this manner caused the phone to go back to a pre-verizon state, with my NAM saying 'SPCS', non-zero service programming code, etc. Many headaches later, and following the instructions posted here, I've been able to get my phone back to the point where it's recognized on the verizon network and making calls. Getting data working, however, has me stumped so far.

Yes, I've searched. The most informative post I've found so far has suggested to try clearing the AAA and HA keys (both using EPST and QPST, though I'm not positive I'm doing it correctly in QPST - screenshot attached), setting the phone into 1x mode and browsing around. I so far haven't been able to get it to authenticate on the network. Not sure if it provides any clues, but the error I get when I can't connect is Sprint messaging "Data Call Failure - Error Code 67 Registration Failure. Your PCS Vision username and/or password may be incorrect. Please try again". I get that as a notification in addition to the WinMO "Cannot connect for an unknown reason" dialog. Here are my settings in EPST if they help:

M.IP Profile
Number of profiles: 6
Active user profile index: 0
MIP_MODE: Mobile IP Prefered
MIP Reg Retries: 2
MIP Reg Retry: 1750 ms
MIP Pre-Reg Timeout: 0
Mobile Node-HA: Enable
Send A Reg: Disable
Dormant Handoff Opt: Enable

MIP Default Profile
Enable Profile: Enable
NAI: 617aaaaaaa@vzw3g.com (interestingly, my MSID does not match my phone number - I remember this was the case from before my current situation, but have tried both my MSID as well as my phone number here and throughout w/o any luck)
DUN NAI: (set via QPST) same as NAI above
MN HA SPI Set: Enable
MN HA SPI Value: 12C
MN AAA SPI Set: Enable
MN AAA SPI Value: 0 (requires a "2" here for 6800 and 6900)
Reverse Tunneling: Enable
Home Address: 0.0.0.0
HA Shared Secret: (erase whatever entry is here leave blank)
AAA Shared Secret: (erase whatever entry is here leave blank)
Primary HA Address: 255.255.255.255
Secondary HA Address: 255.255.255.255
DMU Pub Key: 10
MN Authenticator: 0

Security (following other suggestions - I've changed things in here. not sure what they should be)
HDR AN AUTH User Id (LONG): same as NAI above
HDR AN AUTH Password (LONG): (blank)
PPP USER ID: same as NAI above
PPP Password: vzw

My current rom is dB_ROM (WM 6.5 build 21231), which was previously working on this phone, prior to my trying to flash it to another ROM. Radio 1.04.05V, PRI 1.47_003, PRL 51250 (from here)

Any help would be much appreciated.