I actually rarely hit a 3W and usually in the situations you describe I pull my 3H even though it goes about 20 yard less than my 3W provided I hit both on the button, however, I'm more likely to mishit my 3W than my 3H so the likely result is that the 3H will go further. That said, yesterday and today's 3H was no bueno.
Today's round I decided to take @iacas's advice and swing at roughly 70% and feel like I was more in control. I also decided because I'd be swinging at presumably a slower swing speed that I'd take an extra club and I found success with that strategy.
CR/SR 71.5/126, 6298 yards
GIR: 5/18; 28%
FIR: 7/14; 50%
Penalty Strokes: 8
Quad Bogey+: 3
Penalty Strokes: 6
Shot 41 on a Par 32 9 holer while on a weekend vacation. Two pars and a birdie were the highlight. Course was actually pretty tough... more than a few of the holes it was fairways or bust. I went bust a time or two.