re Clinker LSF
Yes, this is theoretically possible.
Here is how the kiln feed LSF can be higher than the clinker LSF:
If the dust from the preheater is richer in CaO than the clinker, then it will be returned from the filter to the kiln, and the kiln feed will have a higher LSF than the clinker.
Of course, if you have a lot SiO2-rich fuel ashes, the PH dust should then be even richer in CaO, in order to have this special relation between LSF.
If you are using a vey fine CaO raw material, all this could happen, since very fine material is much more likely to escape the PH.
Conversly, the kiln feed LSF can be lower than the clinker LSF if there is a large circulation of a fine material poorer in CaO that the clinker. This could be, for example, a fine SiO2-rich material.