1.) Yes
2.) Look for a tuner with a good post-detection filter. Narrow IF's with steep slopes will help but also add to distortion as you've noted.
Some of the best performing tuners are :
Sony XDR-F1HD
Sangean HDT-1
They use DSP stereo decoding and have very good HD self noise rejection.
Brian Beasley has a lot of good information on HD self noise on his website:
http://www.ham-radio.com/k6sti/
Did you run FMFool to see if you have a strong adjacent channel HD station?
If you have a strong HD adjacent, it will impact your tuner choices as you'll need a tuner with a lot of IF stages and sharp cutoff ceramic filters. Something like the MR 80 or Sansui TU-X1 will fill the bill. The Magnum Dynalab tuners, as good as they are, just won't work as well in that specific situation.
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Main System:
Amati Futura Mains
Amati Homage VOX Center,
Proac Response 1sc Rears,
Three MC2301's for L,C,R
MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
Nottingham Dais with Wave Mechanic
Sumiko Palo Santos Presentation
SurfacePro 3, RPi 4, ROON, WW Starlight Platinum USB, Schiit Yggdrasil, Benchmark DAC3 HGC
MX 151, OppO BDP-95, JVC RS-500 DILA projector, 106" diagonal Stewart Luxus Screenwall Deluxe with Studiotek 130 G3 material.
Lake House:
Ohm F, MC 275V, C2300, MR 77, Rega P3
OnDeck:
McIntosh MAC 4300v
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