Problems with blending mixamo animations

Hello everyone.
I’ve got some problems with animation blending.
I have several loops from mixamo, that I’m trying to mix together.
The problems I’ve got so far are:
-the character stops in the middle(stop animation) and I need him to stop. I guess I should just key the curve parameter “frames” in “path animation”. But maybe there’s a better option
-the second one is that there’s a jump
between the second and the third track, where he starts to run again and I don’t know how to get rid of it.
mixamo_blend.blend (4.4 MB)

Animation
the jump happens because in stop animation, character changes position. There was no option “in place” for this sequence

I’ve kinda solved the second problem. Now I need to know how to control curve movement. I know that you can change the speed with the “frames” parameter. But how do you make something fully stop and then move again after that?