7 His mighty rage, and with imperious sway

sway > power, sweep

8 Him forced (maugre) his fierceness to relent,

maugre > notwithstanding; unfortunately, as luck would have it relent > abate, lessen

9 And back retire, all scorched and pitifully burnt.

311.27

With huge impatience he inly swelt,
2 More for great sorrow, that he could not pas,
Then for the burning torment, which he felt,
4 That with fell woodnesse he effierced was,
And wilfully him throwing on the gras,
6 Did beat and bounse his head and brest full sore;
The whiles the Championesse now entred has
8 The vtmost rowme, and past the +formest+ dore,
The vtmost rowme, abounding with all precious store.

8 formest > formost 1609

1 With huge impatience he inly swelt,

impatience > {Inability to endure suffering} inly swelt > inwardly broiled