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I am currently hitting Nike Pro Combos with Speedstep Shafts Stiff, Shortened 1.25 Inches. IM 5'7, 165lbs. Im not sure what my iron swing speed is but my driver swing speed is between 100-110. I was looking to get more distance out of my Irons, so i was considering new shafts. I like the accuracy i get out of the speedstep, but i was wondering if i would gain alot more distance if i swictched to regular flex? or maybe a light better quality shaft? I feel like I have to swing my irons harder then i would want to , to get any distance out of them.

How is your accuracy? If your hitting tight to the pin, but only can hit your 9iron 130 yards then so be it. Unless your playing at some 7000+ courses on a normal basis you don't need to gain distance you need to gain accuracy. You say you have to swing too hard to get any kind of distance out of your irons, I would say that is because your comparing your distance to a guy with normal sized irons. 1.25" off your shaft is going to have a big difference on how far you can hit them. But the shorter shafts should also give you more control.
Yes you will gain distance with the regular shafts in theory, and also the lighter shafts but you could also be spraying the shots everywhere. 100mph swing speed with a driver sounds like maybe you should be hitting regular shafts, but your gaining more control with your stiff shafts.
so like everything it is a trade off

Have you thought of change the lofts a couple degrees strong?
You will have the same accuracy and get the distance you want and it would be less expensive. besides Phil does it!!

I have read where alot of the pro's adjust the lofts of their clubs. But it is not to gain yardage , only to fill the gaps so they are say 15 yards difference on each club. Some clubs will go up in lofts and some will go down in lofts. Some folks also make the 3 iron a tad stronger so they can get rid of the 2 iron in their bag and free up another club.

Pelz also recommends this for amateurs, Once you find your yardages for each club, take them to a golfsmith to have the lofts adjusted to make all the clubs a uniform distance apart.

Who: I doubt you would gain any yardage going to softer shafts in your irons. I have two sets of irons, one with X stiff shafts, the other with R flex shafts. And I hit the X stiff set of irons longer. It's more a matter of the loft of each club, than it is the flex of the shaft. Yes, you could have the lofts reduced to gain some yardage with all your irons, say 2 to 3 degrees per club. But that would also mean your ball flight would be lower, and you would have more trouble holding the greens. Your 9 iron might give you the distance you get from your 8 iron now, but the ball would also roll out more, the way a 8 iron would. Did you have your irons fit by someone that knows what he's doing, or just figure that you are shorter than average, so you had the shafts shortened? You might want to think of having your irons set at 3/4's of an inch shorter than normal, rather than 1-1/4, and see what that does for you. Most shorter men, tend to have shorter arms, so they don't need shorter irons at all. I don't know if this is the case with you or not, but you might want to double check and make sure you really need 1-1/4 inch shorter clubs before you do any thing else.

The best thing for you to do is to have your irons/swing put on a Launch Monitor to determine where you are loosing out. It could be impact area, launch angle, spin rate...etc This will allow you to understand more about your swing and how the shafts are working for you.. Then the club fitter can determine if you need to change lie, loft, length, shafts....etc to better fit your game.