We used to have a KR-03 in the fleet where I did commercial rides. VNE is (from memory) not much over 100kts. Very easy to exceed that in any sort of botched maneuver. I did some dual aerobatic instruction in a Blanik L-13AC, which was actually quite nice. Better roll rate than the Grob 103 and a relatively decent VNE. Spins nicely.

The type certificate data sheets and AD history for all of the gliders you've listed are available online. I'd spend some time going through those as well as online copies of POHs. Especially if you are planning to take others up, it would be nice if you were operating within the current limitations. For example, Service Bulletin SA-003 prohibits aerobatics in Schweizer gliders overriding the POH (answering the question about an SGS-2-32).