WTVF tech team ... 50% chance of upforging an item if theyre 1 level apart ... I've just attempted it 8 times and succeeded once ... I think you need to do your maths again.
And before they keyboard warriors start with the "that doesnt mean you succeed once and fail once", I know. But statistically speaking its also highly irregular to lose 7 out of 8 attempts of a 50/50 probability.