oclHashcat for AMD v1.30 slow with "mask"

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Because you lose the amplifier. That's very technical and goes back how oclhashcat partially reverses the MD5. The best workaround is to use it as a salted hash:

oclHashcat32.exe -m 20 -a 3 8fa1c84f6XXXX38ccXXXXf04274a0c52:keys ?a?a?a?a?a?a?a?a

That'a slower as it can not reverse anymore, but should be faster than 10220.0 kH/s