1) Is refining items from +7 to +10 using HD Oridecon and HD Elunium difficult? Is the success rate so low that I will constantly drop below +7 and thus have extreme difficulties to get back to +7 or go beyond +7?
2) What about HD Bradium and HD Carnium? Will it constantly degrade to +10? Is the success rate to get it past +12 low?
3) Do my LUK and DEX influence these refining efforts?
4) Is it practical at all to commit a lot of zeny into refining items to that extent? Can you give me a rough estimate of the amount of zeny needed to refine a weapon till +10 and +15?
Please answer all questions. I've studied the topic on iRO Wiki and still can't decide whether to commit towards these daring refining endeavors or not. Have been fretting over it for a few days. Please help.