[Elecraft] K3 question, PSK and AM filter option from G4HUE

Happy Xmas guys and a healthy and prosperous New Year to all. I am a recent convert to the K3 with model 6990.   I am primarily a data mode operator (PSK31 etc. etc.) and my K3 has the 2.8KHz and 250Hz 8 pole filters fitted and let me say its doing a very fine job too. I use HRD version 5 which

Re: [Elecraft] K3 question, PSK and AM filter option from G4HUE

My question is that I would like to be able to simultaneously decode more than 2.8KHz (HRD is limited to 3.9KHz) of the ham band at once. I have thought about fitting the 6KHz AM filter (there not being a 4KHz filter available). One part of me says that would work just fine and the other part