The different coding plugs merely access a number of fuelling maps in the Motronic memory.
As all engines are assembled from parts having been made to a tolerance,there will be engines that are built closer to the optimum and hence perform better than others,therefore some engines will be on the limit of any manufacturer selected fuelling map,(biased towards richness or leanness).
For some bikes,the 'Steptoe link' will move the fuelling further towards that which the engine requires,for others it won't,plus the variables of modifications made complicate matters further.
The only way to optimise settings properly is to try every link on the dyno,quantifying air/fuel ratios throughout.
You may be fortunate and find a standard map which works acceptably throughout the range,after your pipe/silencer etc mods,or if not,you may have to use a Techlusion or similar for fine tuning.
The reason there is not one answer for all the 1150's or 1100's is because of the variables of production tolerances and modifications.
The modified link may work better for MOST bikes,but certainly not for ALL bikes.