I used to do enemas daily - very much against any advices I was getting since everyone was telling me I wiould become dependant on them - I no longer do them and I did not become dependant.
Doing them daily is not an issu... still when you mention: "Really noticeable cramping, followed by some light-headedness (probably die-off). " I am tempted to tell you to be careful. Listen to your body, if you feel pain, take it easy, it is all but a race. The gut lining is very easy to disrupt and you DO NOT want to have to cope with a leaky gut issue.
You are on the right track, the diet, the enemas and the Kefir.
However, if you keep feeling intestinal pain .... STOP the ACV and Kefir en. and stick to plain water enemas... Plus use Marshmallow root tea to help with the inflammation.