Kathryne Keyron card...

[Whispers]

...I've had one for a great good while now (at least two years).??No, it's not for sale.

I haven't used it because I've received varying descriptions of what can and can not be obtained with it.

I've been told that the RMS definition is misleading and that it actually gives the refine rate's respective points to your overall cast time (max of 10 from 150) instead of a percentage (15 if you've 150 cast time/dex).??I've been told that since it is a percentage, it will never give you instacast.??I've been told that it is absolutely pointless and that pope's mitre has greater benefit since it automatically reduces cast time by 10% or adds 10 to cast time or something.

My question is:??is the description given in RMS correct?

Theoretically, if I have 137 total dex, will a Kathryne Keyron card on a +10 [random hat] give me instacast???(137+10%[13.7]=150[.7])

It makes sense to me, but I've received two years of differing points of view on this and I don't have access to a test server atm.
I could get the RMS test server extension again, but, meh.??An extra RO client is too much space on my 93GB HDD (which only has 15GB remaining and Windows needs that much available to defrag).??=\