I just got through a different type of distance problem in that I had a gap in accuracy from about 150-250 ft. I can hit 375-400 with pretty decent accuracy, my mids go past 300, and my upshot are ok, that middle ground of drving off the tee under 250 killed me (along with putting). There aren't many of those holes at the courses I play so that may be the reason, but I just couldn't get comfortable driving my putter and had minimal powering down control on the mids.
Just spent 2 solid weeks drving with a putter and am finally getting the hang of it. The rest of my drives have increased too. I can't get the putter much past 225-250' but I now know where it's going. I would read often how to increase distance with drivers practice throwing putters; I had a big ego block and didn't bother because I was accurate out towards 400' with max "D" out to 450'. I've finally gotten over myself and the putter practice has been great for my game.
Practice drving with putters and mids, you'll be suprised by how far you get them.
*backswing
It makes sense about the accuracy gaps. It's the "in between discs" that causes the problems. We practice full throws, but when you need to throw at half or 3/4 power, it's easy to mess up.
I totally agree with the putter and mid practice. In the colder, wetter weather, I've abandoned practice with anything big. Since the footing is bad, it's a good time to work on standing throws, small step throws and getting good spin. I'm getting my Voodoos to 225-230 now, accuracy is fair, but considering when I started playing I got a Valk to 250, it's not bad.
I did spend time trying distance drivers out early on. I stayed away from the Xcalibers, Detroyers, and the like, but had a collection of Valks, Vikings, Starfires, and so on. But as I played, and played with some other guys, I saw how far things can go. Rocs to 290+, Teebirds to 350. Distance drivers came out of the bag and I spent time learning mids. Teebird was my only driver until I started to get it to 310-320 consistently. Then all of the sudden my Valk went 330-340. WOW! Now I'm back to getting my Gazelles going that far.
It's like a big shift. You start with a putter to 120, a mid to 200, a fairway to 250, and a distance driver to 280. Then it's the putter to 180, the mids to 250, the Teebird to 300, and the Valk to 320. Now it's the putter to 220, the mids to 280, the Teebird to 330, and Valks to 350. Looking for the consistent mid to 300 and Teebird to 350.
Before long, I imagine my putter going almost as far was my distance driver did when I started out.