Let's address my first question,
Are today's big sidecut carving skis as good in bumps as yesterday's straight, narrow waisted long skis(190's)?
I say no. And they could actually be keeping you from being successful in your search for mogul prowress. Yesterday's skis required you to pressure your shins into the fronts of your boots to pressure your ski tips to decamber the ski actually making it arc a turn. Mogul skiing requires you to continuely pressure your tips down into the next bump and extend your legs as you pass over the bump. A natural tendency since you already are pressuring your tips. Of course, your feet were closer and your hands always in front for quick wrist flicks. Today's sidecut carving machines require you to have a wider stance and get different movements to get your skis on edge to turn(carve) with much different if at all pole use. For the average good skier who does well on groomers, has problems in moguls partly because they never skied moguls pre sidecut/carver skis.
Any backing to the bolded bit above? Seems like a gross generalisation.
I ski bumps just as well on "new skis" as I did on straight skis....better actually. Carivng skis were designed to help people carve GS size turns on groomed....bumps typically require a turning radius much less then that...hence old school steering skills are required....good fore/aft balance is required...solid pressure control is required....just like it always was....the issue today is a skier can now do things that were once hard, pretty easily...like leave pencil lines in the snow....thus they think they are now "good"...but as soon as they leave the groomed they fall apart...why? their "technique" is sorrowly lacking...it would have lacked before too...they just might not have known it.
New skis have really only blurred the line of what is good and what isnt good skiing for the general public....
This of course is a double edged sword. I truly believe shaped skis have made skiing easier...this is a good thing, as more people want to do it...but they also pushed the envelope of what is possible...hence the bar just go raised a whole bunch in the last decade....most people just haven't releasied it yet.