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ASD Load Combinations

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Can someone enlighten me on when to use Basic Load Comb. formulas 12-7 thru 12-11, (sec. 1612.3.1 of '97 UBC), in lieu of formulas 12-12 thru 12-16-1, (sec. 1612.3.2), when designing in ASD?
 
It seems to me that, for economical design, formulas 12-12 thru 12-16-1 should always be used since they allow a 1/3 stress increase for wind/seismic, while sec. 1612.3.1 formulas DO NOT. Granted, the 0.75 factor in formula 12-11 is the same as the 1/3 increase, but formulas 12-9 and 12-10 which also include wind/seismic forces, do not allow the increase.
 
Thanks in advance,
 
Larry Hauer SE