It could be. For me 35 accuracy I could miss the mark by a bit and still not see the ball move. When I went to 31 it went way way left or right, but at 32 I'd see the ball sail just past the goalposts and sometimes even hit it. The further I missed it the further to the left or right it would go. It would not go crazy left or right though.
Matt10 is the one who I got the 70 for power from. To quote him "Another year of devs not addressing the oomph! of how kickers kick the ball. As a former kick myself, it's all about height - and the only way to get decent height in this game (ball above midpoint of posts) is to raise power."
When you think about it how many times do you see a kicker missing short? Not too much they usually miss to the left or right. Power at 70 works and you won't be making 70 yards FG's. I don't even attempt it.