ok im posting like 2 tricks to help enchanting..
it worked for me somthing like 75% of the cases..
when u enchant.. u need to do it slow..
keep a gap of somthing like 5 min between an enchant to an enchant..
breaking a simple item..like a D item..sometimes raise the rate of success
just break a simple item before enchanting ur disired item..
sry for the bad english
i hope it will help you...
i tested it alot..and waiting usually helps..
thats all for now