Could try using a plumbers snake to see if there is any obstruction at the tank outlet or valve, then run a garden hose up the same path & method.
I have an 08 GH and I've got good "flow" when I drain the GT, clear connectors show the hose/pipe as 3/4's full or more.
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'08 Greyhawk 31SS Traded in
2018 MR2410RL
Goodyear Endurance
Equalizer WDH
TV 2018 F150 FX4 SC 3.5EB TP/MT
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