But catapults are now fairly worthless overall since there is no sweet spot left for them

PRE & POST Patch one can farm a lev 5 with ballista only.

PRE Patch one could farm a lev 6 with catapults.

Now POST Patch you have catapults die on a lev 6.

battle5.evony.com/default.html?logfile/2a/22/5f/70/2a225f7085f5acb029d6f8cb7dbd7efa.xml

It's not worth loosing that many catapults so not worth farming a lev 6. They should have left lev 6 at least as one sweet spot for a catapult.

As it is now there is nothing that can out range a lev 6 wall or higher.