I'm deeply against this change. I understand that some players may be penalized by that but, in reality, we're going in an even worst direction.
The refining mechanics are crucial in here and if end-game gears are put in question, such as the best Expedition gears and acessories, we're going to have an ABSURD increase on ore usage, and consequently, zeny.
To be more specific on this thread: the particular chance of an armor going from +7 to +9 on normal ores is represented by: 20% * 20% = 4%
The chance of an armor going from +7 to +9 on Enriched ores (and the original kRO:zero HD ores) is represented by: 40% * 40% = 16%
As you can see, we're multiplying the efforts needed to get an +9 item by 4 TIMES, which is insanity if we are talking about already expensive and unnacessible stuff, let's remember that the flat cost of these stones are 1,75 million zenies.
I strongly advise you to reconsider this change.