It sounds like you have things correctly connected. Have you connected anything to the Track16 USB port? (You can't have both the USB and FireWire connected simultaneously.)
From the Apple menu, please choose About this Mac and then click the System Report button. In the System Report under FireWire in the Hardware category, do you see the Track16 listed on the FireWire bus? (It may be listed as something like Vendor 0x1F2 Device 0x101800.)
It is probably best to leave the drivers installed, that way you can make changes to the Track16 via the MOTU control panel when the Paca is not using the Track16.
When you want to make a change to the MOTU, start up Kyma and then select Halt from the Control drop down menu; then, start up the MOTU control panel and make the changes. Next, quit the MOTU control panel application and, in Kyma, select the Track16 from the Audio Input drop down menu.