If you want to beat gw then concentrate on that goal. If you want to excel in arena do that. If you want to score well in the raids do that. You have to pick where you put your resources in this game. Clearly those who can't beat HaaT put their efforts elsewhere. So don't be mad you can't beat this part of the game.
Is your primary GW team a self healing team so they have tm and health on the hard nodes? EP or wedge leads are great for this.
Do you have a much stronger arena team than the rest of your roster? This causes you to have hard nodes hat the rest of your roster can't scratch.
How are your mods? Did you stop farming toons and focus on getting high end mods with speed secondariers?
The whole game requires either a lot of money or t are offs. You made trade offs that make you not able to beat gw. Sorry.