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Okay I tried that half-life 2 episode 2 final battle again, lost 1 house this time (not the beginning sawmill).

I found thrown objects extremely effective against hunters, just pick up a stump and throw it at one, two hits usually do it. If you get close, you can reuse the same stump and finish your job in seconds. But the the last strider in a wave always picks up haste so you ain't gonna get away with this trick alone. Some timing or remembering the patterns might be necessary.

As for the beginning sawmill, the trick is to not kill the first one too far away from the sawmill and position yourself near the teleporter at the moment of its death. When the second one hastens up it will leave its escorts behind for a brief period of time, and that's your chance. I fired the bomb next to the teleporter killing the second strider.