They make 25w HID kits?
35w should be fine in any fog light. 55w is where I don’t recommend putting them in small spaces like fog lights. I’m running 55w in the head light and have had no issues. Did the same thing on my Maxima.
I’d go 55w 6k low beam (same as mine) and 3k 35w fog light (same as my first picture above). I’m probably going that route again, but wanted to see what people though of 6/6.
You should be fine going with 35w all around, at the least.