Vinegar rinses

[Eastbound&Down]

I've done about 3 washes with a final vinegar rinse 1x a week on wash day. The first 2 times, my hair was so shiny and soft, but this last time my hair seems a little dry and poofy... I did the same thing all 3 times using a bottled water and vinegar mix. I tried to find a thread but alas had no luck.

Any advice from people that do these rinse regularly?