Video reference is all good but dont rely on it in such a rigid way. Try and go through it and find the key poses and just thumbnail the key poses that you need.
Good quality animatoin is all about timing and spacing, you need to show contrast between your extreme poses.
There are some nice poses in your videos you just need to really plan the whole thing through on paper first, alot of the beliveability will come alot later when you go in and start offsetting your values and clean up your curves into extremes.
Photo reference is great but dont use it in a tracing style , step through it and try and grasp what makes each part of a motion work.
Also i recommend you dont use smooth curve until your happy with all your poses. If you want more help you can contact me at email@example.com
Ill put up an example jump animation or somthing to show you
Makes me very happy to see people doing some animation KEEP IT UP !!!