The cavity back helps to make off center hits go further, as well as reduce the amount of sidespin put on the ball. In other words, your distance will be more consistent (making a club more reliable), and it won't slice/hook nearly as bad (if you struggle with that).

The wide sole is a blessing/curse sole - it reduces the amount of fat hits (chunking the shot), but can increase the amount of thin hits (because you bounce that fat shot as opposed to dig in the dirt). That said, it'll only hurt you around the green, as if you thin it, the ball tends to get going in a hurry.

Keep your 3W and LW, and invest in a partial set of cavity backs (ie every other iron 3-5-7-9), and give them a try.

If you see your local club builder/fitter, you can probably get them for pretty cheap.

Heck, I can probably build you something that'd be easy to try, and I could do it cheap.

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True Length Technology Fitter - www.truelengthtechnology.com
It's live! - www.ShipShapeClubs.com
PCS Class 'A' Clubfitter

A new highlight: Golfing the home course on Christmas Day.

I say it too often: If it's golf club shaped, you can play with it.

For the record, I'm a club doctor, not a swing doctor.