plastic profile design bottle cages come with two sets of holes for multiple mounting heights, not sure if this solves the problem but it might get you another inch, which might be just enough... You can also move the bottle behind your seat with a mount similar to TT gear, but not nearly as expensive. Mine was about $20 from my LBS, so must be cheaper online, brand like XTAC or something like that, they are nice and allow for any bottle size, still sturdy with said profile design bottle cages.