Testing out different bikes is fun!
It's good that you can tell the differences between different geometries and ride characteristics so easily.....you sound like a natural for cycling!
All the small differences in geometry; fit; etc. can quickly add-up to make BIG differences between bikes- as you've observed.
Sounds like you are definitely on the right track!
Have fun test-riding....and get the one that really speaks to you! (Sounds like it's the R2 so far....)