lowering the cylinder,
shortens ex, and tr, dur
lengthens in, and st, dur
strato is part of the intake process. the longer the strato dur is, the shorter the intake dur needs to be. the more clean air that enters through the stratos. the richer the air/ fuel ratio has to be entering the intake. need to make it balance. the air/ fuel ratio in a std engine is around 14/1. a streato is around 8/1. this is corrected in the combustion chamber when it mixes with the clean air. some of the clean air is lost out the ex port. this is the wedge of air they talk about.
the belief that a strato burns less fuel to make the same power as a standard engine is untrue.it just doesn't waste as much.
the strato timing can only be changed by raising or lowering the cylinder, or raising or lowering the top edge of the port in the piston.
so now you have more questions then I have answered