Anyone solo mining, or is it just too much of a crap shoot at this point?

Are the steps (given here http://cryptovore.com/2017/07/19/how-to-mine-signatum-sigt/) for solo mining the preferred method?

Can you combine rigs to increase your chances, or is each rig essentially on its own? Managing 150-200 MH/s per rig.

... also, what's the definition of "LUCK" with regard to values given on mining pools pages?

THANKS