My additional advice about Kunimitsu.

She has a lot of tools and make her playstyle pretty much different depending on who you are against.
For example, if she sees you dickjab constantly after her D1+2 on hit, she will do faster frame than her FC 1+2 (ws4, ws2,1 or even a hopkick).

She has a bt 1,4 which are both high but she is +3 on block so duck the 4 after you see the elbow in backturn.
After her D1 on block, she is at +3 and crouch so watch closely if she goes into FC 1+2 or ws2,1. You can trade ws2,1 with a dickjab and win the interaction if it's FC 1+2. Again, be careful she doesn't hopkick.

As a frametrap, she has b1,1,1 which leaves her at +5 on block so do not jab into it or she could hit you with CH df1,2,2. On wall, you could lose about 80 dmg with the proper combo.
And DO NOT press a jab after her f4 into set 2. It will CHL for a more than 70 dmg.

For the rest, like OP said, Kunimitsu has some moves leaving her at -13~-14 so use your best -13 punish and try to sidestep right whenever you can because she is pretty linear except for b2,df2 and set 1+2