Hi Mike,
no need to persuade me about the strength of you rods
, it is pretty obvious they are something special!
But back to the tip
. Of the rods I have seen break on the cast/playing a fish, it tends to be either the butt, just above the handle, or about two thirds up the blank. The tip is under less pressure as the rod starts to reach it's full bend, as can be seen on YouTube if you search for Hardy/Greys rod test. Makes good viewing.
However, tips break a lot, normally when the angler is pulling line through on setting up, causing an extreme angle straight on the tip.