[Elecraft] fldigi and flrig and the filters of K3 and KX3

[jsdroyster at nc.rr.com]

Hello to all and THANKS in advance for enlightening me on fldigi and flrig used with KX3 and K3.
We havwe been doing fine with fldigi alone (no flrig) and PSK on KX3 and K3.
Now Larry (my husband K4MWE) wants to branch out to RTTY and to try CW via fldigi.
(Yes, we want to learn to hear CW but Larry's hand is not going to be able to transmit with the key he bought years ago.)

So here is the question:  
In PSK I grasp that the bandwidth on the KX3 or K3 is set wide to establish the waterfall.
For RTTY I understand that the radio has the special dual PB filter, BUT do I use it OR do I still set the wide filter for the waterfall?
(I tried using the RTTY filter of the radio and the waterfall was 2 narrow blue tracks.)

If RTTY usually is at 14080 and above then do I want the waterfall to start lower than that?

Bumbling along on the digital learning curve...
73,
Julie KT4JR