This is Maria. At this time I am here to talk about long putts x timing.
When facing long putts I often see people increasing strength at their hands in order to make the ball reach the hole. It is ok to do it but it may compromise the timing of your stroke.
Instead, I suggest that you widen your stance.
It will allow you to perform a bigger movement of the putter head through out the stroke, providing strength to the ball without the need to change your putt stroke timing.
Wish you all the very best and good luck with your long putts.