I think I probably see more chaff than you do, but not as much as it sounds like the west coast uses. Either way, with a Dwarf army, I'm not going to win the chaff war, nor am I going to get to dictate the matchups in combat. The conclusion I came to is that there is just no use trying to win either of those. Instead, I need to find a way to make that work for me rather than against me. A horde of Shieldbeards with a RoStoicism on their banner does that--using Core points! With this unit on the table, I can push it down my opponent's throat, confident that my opponent will have to basically kill the unit to the Dwarf in order to keep away from my Hammerers. I can very consistently take out my opponent's chaff units that pose critical threats with shooting from Organ Guns. It takes some skill in reading your opponent and assessing the spacial distribution of tactical elements and their positions and potential movements, but that's mostly just a matter of intentionality in measuring and analyzing. You tend to do pretty well with that. I guess what I'm trying to say is that you really have to decide which you want. You're just not going to have the points available with all the other requisites to take both a decent unit of Ironbreakers AND a decent unit of Hammerers. I prefer to have the Hammerers, meaning that Longbeards with sword-and-board are just a fantastic counterpart for them. I'll link a couple of battle reports below so that you can maybe ascertain some of the differences for yourself, because if you're going to use Ironbreakers, you'll have to get your high-strength attacks from Core, meaning either "Greatwarriors" or "Greatbeards" as their counterpart. (Negotiating the MRoGOE is also something I just cannot seem to do successfully at 2500 points, due to the cost of the Rune, so I acknowledge I do have some obvious limitations in my perspective.)
(I use Hammerers in these battle reports.)
(I use Shieldbeards in these battle reports, and the tactical concept of maneuver is virtually identical between the Shieldbeards and Rangers as it would be in a more conventional force between Shieldbeards and Hammerers or Ironbreakers and Greatwarriors.)
(I use Shieldbeards in tandem with a horde of Greatwarriors (essentially the same tactical relationship you'd have with Ironbreakers and Greatwarriors or Greatbeards) in these battle reports. These were the first games where I used my Shieldbeards in horde formation.)
(I use Ironbreakers in tandem with two hordes of Greatwarriors in these battle reports. They're a couple of my worst BatReps, but they were important enough, I think, that they warranted sharing. The discussion is also good in the comments.)
(I use Hammerers in tandem with Greatwarriors again in these battle reports. These were my first games with the new Dwarf army book, I think.)
(I includ this last one so that you don't make the embarrassing mistake I did if you so choose to use Longbeards.)
You'll note that in most of these battle reports, I haven't made much/good use of Gyrocopters. I've played several games now where I've included two Gyrocopters in my force, and it's made a huge difference! They really shine, and 2 seems just about perfect. (Three would be happy, 4 would probably be too many.) But 80/100 points has to come from somewhere... Hope some of this helps on some level.