As a senior golfer, I currently use ProV1x and NXT Extreme. The NXT in colder weather (60deg. or lower)and wonder if I am using the right balls. I have most of my clubs with a stiff shaft. Steel on the irons and weges and stiff graphites on my driver and fairwway woods. At my age, 69, I have been told by the local Pro that I don't seem to need anything else, but thought I would check with you.