I’d say you’re off to a good start investigating the adductors. Look for stiffness all through that medial chain (adductors, hamstrings, VMO). If you already know it’s mad-tender, than you’ve probably found a big pain generator.

It would be also useful to know if anything else about your running technique is compromising these tissues. Case-in-point, you turn your feet out when you land from your jump. That probably results in a little collapse towards the middle, right? It could be that you’re expressing that same mechanical issue when running (your knees collapse slightly inwards), which is overloading and infuriating those tissues.

If you resolve the problem with your jump, create a stronger squat, and attend to these soft tissue issues all together, you may get some good results.

Keep us posting on what you’re trying and what works!