Sounds like the issue you are having is your DMU needs to be reset.
I have both a Sprint and an Altell TP on VZW right now, so I may be of some help...
Load up the Verizon Rom as it tends to help when I have connection problems. Now, try the *228 #1 and #2 options just to get us on a baseline.. Follow this up with HTC CM Killer:
http://forum.ppcgeeks.com/showthread...ive+htc+killer
Let's go through your ##778# options. To enter from a VZW stock rom I believe you have to press the send key after entering the number, if ##778# doesn't work, try ##778 send.
Your main items are going to be your Security Tab Make sure both user IDs are:
Yournumber@vzw3g.com
Next, go to MIP default profile:
Make sure profile is Enabled
Set your NAI to:
Yournumber@vzw3g.com
mn HA SPO Set: Enabled
mn HA value: 12C
MN aaa Set : Enabled
MN aaa value: 0
Reverse Tunneling: Enable
Home address: 0.0.0.0
Primary HA: 255.255.255.255
Secondary HA: 255.255.255.255
HA Shared Secret: Delete any number and leave blank
AAA Shared Secret: delete and leave blank
From here reset then try to connect to Internet.
If still no good, you are going to have to call VZW, tell them you had to do a hard reset and lost internet requiring a DMU reset. When they give you the number, WRITE IT DOWN! You will need it again at some point in the future.