Well, for Kula, her c.C is really fast so you could hold back and hit C to see if you can get them. Most weak DP moves are as fast as her close C, but an EX DP is even faster. In terms of frames, Kula's EX DP has 3 frames, her strong DP has 4 frame start up, and her close C has 4 frame start up.
I don't know the frame data for safe jumping/hopping, but if it's -4 or slower before you hit the ground, you can poke them with any of these moves.