and how do i roll back to the stock timings, just reinstall the drivers or ?
Ouch! That would be an awful process

Simply restart the machine. Or save the output of --current before applying custom timings, then reapply those saved values when you want to revert.
On windows, disable/enable via device manager or one of the similar tools may do the trick, but I haven't tried...
disable/enable does nothing i think, i forgot to save the stock timings.. i hope the reinstall will do the trick xd