I am mid-age and do not hit my irons long at all.  My 8-iron goes max 125 and 6-iron maybe 140.  I drive about 240.  I manage to shoot low to mid 80s because I am pretty accurate.  Most every drive is in the fairway.   However, it really bothers me that my irons are so weak.  I am in my late 40s, but in fit condition with no major ailments.  I have some low back issues which slightly impedes my swing.   So in my effort just to get my irons to normal distance I have...