I'm confused by your percents because they seem awfully low compared to the amount of battles I actually get into. In HG/SS most of the percentages were 15-20. I changed the grass encounter rates to 10%, and the cave/water rates to 5%. If the percents you gave me are indeed correct, then theres NO WAY B/W uses them in the same way that HG/SS does, because then I'd be getting encounters less frequently than in the soul silver game I modified (which is certainly NOT the case).
If I could slash the rate in half across the board, then I think that would be OK, but there's either something wonky about the way B/W handles percents, or the way that kazos tool modifies them.
Thanks for the replies so far everyone.