Concerning US 4366234, Wheatcroft et al.
You don't have to cook cour own Hydroquinonemonosulfonate. Try an alternative FD, maybe that
ZoneV FD
Tab water 750ml
Calgon 2g
Sodium-Sulfite 1g
Metol 2,5g
Sodium-Sulfite 21g
Potash 14g
Sodiumbicarbornate 12g
Hydroquinone 6g
Phenidon A 0,5g (solve in 15 ml warm Glycol)
Potassiumthiocyanate 1g
KBR 2g
Potassium-Jodide 10mg
NaOH Sol. 10%ig 20ml
Benzoetriazole 100mg
Fill up to 1000ml pH 9,65 at 25°C
Process regime is done with normal times and temperatures, workes quite well but not perfect. Quite a time ago I mixed up various (E6) FirstDevelopers and this one is not the worst...
ZoneV FD
WheatcroftFD
Proper Homebrew