Tradeskill failure rates

[BarackObooma]

Does anyone know the formula for the success/failure rate for combines such as research and tailoring?

I was 82 in tailoring and trivial is 88 and failed 6 out of 7 ten slot backpacks. At 85 skill, I was 1 for 2.

Trying to combine my 29, 34 and 39 spells, I'll be 2 points short of trivial and fail about 4 out of 5 times. e.g. 120 research skill at 39, trivial is 122 and fail almost every time.

Trying to find words on a low pop server with no EC tunnel and not being a porter really really sucks.

I gave up trying to make 34 spells, it was faster to level to 39 then to find enough words to where I'd be successful which is ridiculous.

That being said, I don't know if I've just been extremely unlucky or if something is going on. I thought trivial things should fail around 5-10% at most.

To clarify also, it's been my understanding as an INT caster, my INT affects my % chance of gaining a skill up and not the failure rate of combines. Is that correct?