FYI - Just noticed that Washington State just published a new premium schedule for Medigap plans for Jan 2020 that for the first time includes Plan G HD options. The only difference from F HD that I can see is that G HD doesn't cover the Part D deductible of $198.
F HD premiums range from $44 to $92 and G HD premiums from $47 to $66.
https://www.insurance.wa.gov/sites/d...p-plans_29.pdf