SNAT Routing with Routing Domains

I have a test Big-IP setup in an attempt to consolidate NATs and SNATs from several different VLANs onto one device. I setup route domains for each externally accessible VLAN and I'm testing a SNAT to establish communication between a server on a branch office private network to a customer site via a private company network and the internet:

Office Private Network              Company Private Network     Internet            Customer
192.168.100.107 (server)   ----->  10.90.58.84 (SNAT) -------> (Public NAT) ------> 189.189.189.189 (Destination Server)

That connection only works if I use a specific, static route for the customer's IP address but I'd like the Big-IP to use the predefined routes I setup for each route domain. The SNAT is setup as:

Translation IP Address: 10.90.58.84%58
Origin Address List: 192.168.100.107

Here's my setup:

 Route Domains:
Name        ID      Description     Parent Name     VLAN                                    Partition
0           0       Default                         mgmt,scomm, http-tunnel,socks-tunnel    Common
RD.48       48                                      VLAN.48                                 Common
RD.50       50                                      VLAN.50                                 Common
RD.58       58                                      VLAN.58                                 Common

Self IPs:
Name        IP Address          Netmask         VLAN        Traffic Group               Partition
48_self     10.90.48.15%48      255.255.255.0   VLAN.48     traffic-group-local-only    Common
50_self     10.90.50.15%50      255.255.255.0   VLAN.50     traffic-group-local-only    Common
58_self     10.90.58.12%58      255.255.255.0   VLAN.58     traffic-group-local-only    Common
scomm       192.168.100.10      255.255.255.0   scomm       traffic-group-local-only    Common
MGMT        172.16.10.25        255.255.255.0   mgmt        traffic-group-local-only    Common

Routes:
Default
Destination 0.0.0.0
Netmask 0.0.0.0
Gateway Address: 10.90.48.1%48

RD.48_Default
Destination 0.0.0.0%48
Netmask 0.0.0.0
Gateway Address: 10.90.48.1%48

RD.50_Default
Destination 0.0.0.0%50
Netmask 0.0.0.0
Gateway Address: 10.90.50.1%50

RD.58_Default
Destination 0.0.0.0%58
Netmask 0.0.0.0
Gateway Address: 10.90.58.1%58

Any glaring errors in my setup?