No, actually Mammonite type SN are not that bad even if they are using Inca. i most likely do 20-30k damage to other jobs and 50-60k to SinX even if my opponent is geared my damage will not be below 20k.. but if the opponent is wearing reducs the estimated damage is about 10-15k per Mammo so i might say its not that bad since you can also spam mammo fast enough.
And another thing, im gonna edit about the 3xTG+1xThana since 3xTG doesn't stack, might as well be 2xTG+1xThana+RandomCard like what you suggested. Thanks for correcting me though