This is great advice. Another thing about hitting the safe shot on the par 5 you mention is that the vast majority are not reaching that hole in 2 anyway, so why not eliminate the potential for trouble off the tee?One key to breaking 80 that I discovered is long ago is to develop a "safe" go to shot off the tee that keeps the ball in play and also make my approach target the middle of the green no matter where the flag is. For me the safe shot is a lower trajectory punch wether it's from the tee or the fairway. When my "c" or "d" swing rears its ugly head during a round I will go to a punch fairway wood off the tee, take an extra club on the approach and punch an iron to the middle of the green. If I'm in the middle of the fairway it pretty unusual to make worse than bogie. The double and triple bogies are almost always a result of a poor tee shot or trying to hit the hero recovery shot. When I first started shooting in the 70's it also helped me to approach a 79 as 7 bogies and 11 pars. 7 bogies is a lot, but if you take your medicine and play for bogie when you've hit a bad tee shot you will make a lot fewer doubles and triples.
The safe shot off the tee on longer par 5's is also a strategy that will lead to lower scores. We have a 530 yard par 5 at our course that narrows down at about 260 yards that also has a large tree on the left at 290 that can completely block out the second shot. The green is elevated, heavily bunkered and has OB right. I've learned after my first dozen rounds that I was way better off playing my 2 wood off the tee to make the 2nd shot easier. Last month I was playing with a couple scratch golfers who hit hybrid/long irons off that tee and hybrid for their second shot. Their strategy is absolutely the correct one, you really can't miss that fairway as it is very wide at 200-230 yards and the bunkers don't start until 230 yards. I now play a 4 iron or 4 wood off the tee and haven't missed the fairway or GIR on that hole since going with that strategy. I no longer have to worry about the 290 yard tree blocking me as I now can go over it if I miss my tee shot left.