I don't agree with Walcott's speed really, no. However, a lot of people don't like it when stats are messed with. I will boost Walcott's speed on my personal file but I leave that kind of stuff down to people who d/l the file to do for themselves. I do think I might knock his speed up by one or two points for the next update though.
I also dont like messing too much with stats but I think a few players by a few points is very acceptable, like your OF, you haven't gave any1 any super boosts and the players yu have improved deserve their stat upgrades. I wouldn't moan if Walcotts stats were improved on your next update lol