I've thrown my R11's in the bin, they are so much hit and miss, some times you will get the extra yardages from cally's on the 120 & 135 iron, some times you don't and they come up well short, and with the faster meter and meant to be more forgiving than burners? seem the same at best. My game is just the same with burners so gone back to them for the slower meter, and less chance of clubs coming up short due to not having the extra yardage you expect. Total waste of $$. (but i do play with them occasionally in challenge matches just to stop the dust collecting on them.lol)
here's a rough guide to burners with extra yardages' due to standard cally's, and how they are with spin:
Club xtra yardage with cally (Z) with full backspin
125 Pw 131 122 (123 sometimes)
135 141 132
145 152 142
160 168 157
175 185 172
190 200 187
205 215 203
220 235 (some holes its shorter) 217
R11's
120 125 if your lucky 116
135 140 if your lucky 131
150 157 146
165 173 161
180 189 176
195 205 191
210 222 206
225 235/240 221
These are all from fairway, you need to add a couple of yards distance wise from the tee
By messing around with half back spin you can also get your clubs i.e 190 iron will be 195 with half back spin. Just takes time to understand what effect half spin has on certain irons. If you had 190 yard approach, full back spin on 190 iron is 187 yards, but if you give say a bit less back spin than full, you can get the iron to be 190 yards. (al this is with standard cally's)