TomatoUSB

Hi all. I'm looking to all of you gurus of TomatoUSB for a little assistance. Here's my situation… I needed to move my coverage area for my wireless to somewhere towards the middle of my house. The thing prohibiting me is the phone jack connection point for the DSL Modem (yes, archaic, but eventually going to upgrade to FiOS when available). So, I'm utilizing another, better router as the WiFi access point and just want to link the main router to the new one via CAT5. I thought I had set my TomatoUSB configuration correctly, but I keep getting drop outs on anything connected via WiFi or via CAT5 on the Tomato router. I'm guessing the stock router doesn't particularly like keeping the connection active to the Tomato router. Anyone have any configuration knowledge on what to do in this type of configuration? Ask any questions necessary if you want more info about what I'm trying to achieve.

Specs:
DSL Modem: ISP supplied
Main Router: Belkin N+ F5D8235 (stock firmware)
New Router: Asus RT-N66U (regular Tomato USB)