[Elecraft] K3 Filter questions

[Dave (K7DRT)]

I am still studying the K3 and the various options I use. I still plan to purchase one.

My previous radios  (IC-756PRO the last one) I used 2.4 khz and 1.8 kHz for SSB and 500 hz & 250 hz for CW / Data.

The K3 comes with a 2.7 kHz 5-pole filter.

My SSB questions are: from your experience, 1)  which is better for a narrow filter for SSB; 2.1 khz or 1.8 kHz?
2) Which is more useful, 2.7 kHz 5-pole or 2.8 kHz 8-pole?

My Data question: Is the 400 kHz 8-pole adequate or should I purchase an additional (250 hz or 200 hz) filter?

Thanks & 73 de Dave K7DRT

P.S. I did read the “K3 Crystal 'Roofing' Filters” It was very helpful.