No way those Dominator GT are D9GMH, maybe another sort of D9, but probably they are ProMOS or PSC. That's why the Kingston value RAM is performing better, it's only about the chips.
Also, 1M is a pretty meaningless memory test. Sorry.
Can you try the lowest voltage you need for 32M at 400 3-3-3-9, 500 4-4-4-12 and 600 5-5-5-15 with the HZ?