I'm not sure what numbers you're looking at, but a lot of your MNK parses are wrong. Unless you can give a source to where you got those numbers.
Here's the current rDPS standings in FFLOGS as of today:
MONK
E5S - 19,827.67
E6S - 18,223.72
E7S - 18,430.14
E8S - 16,067.73
DRAGOON
E5S - 19,721.15
E6S - 18,899.32
E7S - 18,323.13
E8S - 15,791.82
NINJA
E5S - 19,655.62
E6S - 18,669.65
E7S - 18,215.48
E8S - 15,989.42
Sources:
E5S
E6S
E7S
E8S
At 99th percentile Ninja is ahead of both, DRG and MNK in fights that have more frequent disengages (E6S, E8S and is practically tied with it on E5S). Samurai just blows them all out the water though unfortunately.
This raid tier overall has been pretty diabolical for Melee with buffs, SAM's been pretty lucky in the sense that it doesn't have oGCD buffs such as: Lance Charge, BL, RoF, Brotherhood, TA windows etc. all of which can contribute to its higher DPS because these fights have multiple phase changes during buff windows which either get forced out of alignment. Needless to say SAM is naturally OP anyway, but this raid tier has really shown its strengths and brought to light just how far behind the others are. I'd say the balance between MNK, DRG and NIN is for the most part really good. So while yes, at max percentile MNK, with perfect RNG on crits, chakras etc MNK is ahead. It becomes a lot more even at the 99th percentile when you don't get the God runs, though still slightly ahead.
Still hoping for some changes to play for MNK in 5.3 considering they said there would be more job adjustments. Will our feedback fall on deaf ears or will they finally change some of the more immediate problems to at least make us fun to play again?