NAT'ing on two WAN interfaces with VPN

I'm having a NAT problem with an ASA5510 (v7.1(2).

Currently there is one T1 which hits a router and is then connected to the ASA.  I set it up a year ago and it's been working fine.

The outside address is 67.x.x.228 and is a target for several VPN clients.
The current static route is 'route outside 0.0.0.0 0.0.0.0 67.x.x.225 1'
The current NAT commands are:
global (outside) 10 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 10 0.0.0.0 0.0.0.0
There is no DMZ
The only access-list is 'access-list inside_nat0_outbound extended permit ip any 10.80.104.0 255.255.255.0 ' (these internal numbers are the VPN pool addresses)

All of this works well. Standard Stuff.  The VPN is a split tunnel and works OK too.

Now they added a cable line, want to move all traffic (except MX) to the new interface, and keep the VPN and outbound MX traffic on the original interface.  The new line has a gateway address of 75.x.x.22 (numbers IP and gateway given me by comcast)

Note: Their email is hosted off-site on an Exchange Server IP 207.x.x.x

So:

I created another outside interface called 'outside_comcast' with a security level of 5 and an IP of 75.x.x.21

I changed the old static route to 'route outside 207.x.x.x 255.255.255.255 67.x.x.225' (static route to MX server thru old interface)

I created a new static route 'route outside_comcast 0.0.0.0 0.0.0.0 75.x.x.22' (default route now on new line)

I tweaked the old NAT command to 'nat (inside) 10 207.x.x.152 255.255.255.255' (10 is a single address (outside interface) pool)

I created a new NAT command to 'nat (inside) 11 0.0.0.0 0.0.0.0' (11 is a single address (outside_comcast interface) pool)

I have a 'global (outside_comcast) 11 interface command

My relevant commands look like this now:

global (outside) 10 interface
global (Outside_Comcast) 11 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 11 0.0.0.0 0.0.0.0
nat (inside 10 207.5.72.153 255.255.255.255
route outside 207.x.x.153 255.255.255.255 67.132.35.255
route Outside_Comcast 0.0.0.0 0.0.0.0 75.x.x.22 1

Result:

Internet, etc works fine.  MX clients can sync up.  All good.
But I lose VPN.  It's like the 'outside' interface no longer exists.  I don't think its VPN config, cuz I can no longer ping the 'outside' interface (from the outside) and I could before the change.  I can ping it from the ASA, and I can 'extended ping' from that 'outside' interface to the MX server.

I've tried a lot of tweaks, but I'm missing something basic in NAT'ing.