smaw question of weldability of inverters

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thanks for the replys on yesterdays question.    to be more specific about my concern is, i want to but a cst 280.   while demoeing a cst 250 i noticed the arc isnt easily overcome by molten slag and flux, it fights rather well.      very smooth arc.        the problem i had is the end of the rod seems to deposit the same amount of material to work piece whether your holding a long arc or short arc.     you dont really notice it till your doing a vertical uphill weld w/ 7018 and your puching in on side to side. and you end up w/ a lil undercut because of it.         on other types of machines the longer the arc you hold  the less metal deposit you have for that second, then if you suddenly puch into the crater it deposits that extra filler metal from when you held that long arc.   which is important to me welding out of position w/ 7018 .          now w/ 6010 you really notice it on your hot pass on pipe.                now i dont expect anyone to resolve my problem, but what im wondering is, is this the nature of the inverter or are some inverters different in this situation.        miller claims to have really aimed this particlar model towards smaw in performance.        ive also noticed theres alot more miller inverters out there than lincolns.      i dont mind spending the extra 1500.00 dollars to get the xmt or intervec 350, if theres any difference in the weldability, however i d rather carry 35lbs on my side instead of lugging 80lbs in front of me.        ive usually favored the older lincolns over millers for the reason of a crisper arc w/ a lil more dig.        however i dont know if that applies to inverters     thanks for any feedback.