My question is this, is putter precision the cause of these frustratingly close misses.
While this might be true in some cases the overall answer is No. Why?
My guess would be you're using the wrong technique for the hole. Some holes excel with the Vertex method, others grid, others dot's etc. Just gonna take some trial and error to find out which technique, if any will work for your current putt.
I.E. On BPB, the par 5 4th is a great time to use Vertex method if you're behind the hole (front pin location). If you line up the right vertex and hit the Ding its almost a guarantee when your in the 10 - 30 foot range. Same holds true for BPB front 9 2nd par 3 over the pond. If you're to the right of the pin the correct vertex sinks the putt almost every time.