xtol developer problem/question

I tried using Xtol developer for Ilford Delta 400 film (120 roll) last week and had very poor results. First of all when I mixed in the second part of the two part developer it formed this giant crystal(at 68degrees) which I had to heat and leave over night to get it to disolve. Then, when I developed my film (used xtol at full strength and developed for 10.5 minutes) the film came out with a slight greenish tint and therefore all my prints are dark and very grainy. I am clueless. Does anyone have any suggestions which might set me in the right direction?

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