I have been using long the Dunlop tennis balls for a long time. Mostly used hard court championship balls. I am noticing this year that these are balls are tough to control. They had always been on the heavy side with lots of felt and this is not a issue. I actually like that about these. but this year, ball is little bit harder and has issues with flying long. Has anyone else notice this ? I mention this because Wilson had similar issues 3-4 years ago but they seem to have fixed that issue and now has great control. especially US open hard court balls.