I have an SLX30 and an SLX22. (not the latest extreme jobbies, but 2007 and 2010 versions.
On a run of 5 off 1960's town houses I use the SLX 30 at the front, doing all the tops only - the ground drops away a bit and it lets me stand well back, work over cars etc. Then I drop a section to make it a 25ft and do all middles and bottoms and then all the backs where I stand a bit closer and the ground rises a couple of feet.
But if there are two of us working I do all the front tops and my man Dan uses the SLX22 to finish the fronts while I do the backs.
But some very modern three storey jobbies and an SLX22 is fine.
If you had an SLX30 then I would just drop a section - can you do that with your present pole?