You may have to change your technique a bit to get the most out of the whip. If you're used to using a stick that's "too stiff for you," you may be used to quickly snapping a shot off, without a whole lot of loading, relying on moving the stick really quickly as opposed to truly loading the stick up. With this style of shooting the lag from a whippy stick can just screw up your shot.
To get the most out of a whippy stick you need a really pronounced loading phase to your shot. I've had a hard shot for quite some time, but I've recently modified my technique a bit (after watching a video posted on these forums by Jarick), and I find I'm getting more power out of my whippy sticks than ever before. Here's the mechanics that are really working for me at the moment:
1) Pull the puck in fairly close to my body, so that in shooting position the heel of your blade is only about 1.5-2 feet from your closest skate
2) When the puck has been pulled in, start loading the stick. Get your weight over the stick, push down and forward with your bottom hand, pulling back with your top hand. Make sure you aren't just slapping forward, you want to really be loading the stick, it will create a slight pause in your shot where the puck gets just ahead of the blade, where you can really feel the stick loading up as if it were a bow being drawn. This is really the key, there's a big difference between loading the stick and just sort of smacking at the puck, it'll just feel "right" when you get that proper load, you'll feel the entire stick really flexing out then snapping back
3) Throughout the shot (pull, loading and release phases), keep the puck near the toe of the stick. At the start of the loading phase the mid-toe region will be in contact with the ice, with the heel just slightly off the ice. This really lets you load the stick properly, without it "slipping out/forward" on you. You will naturally be loading from the toe when you pull the puck in close, because the heel of the blade will naturally be a bit off the ice
4) The puck will briefly get in front of your blade during the loading phase, but don't let it get way out in front, ideally you want just a little bit of separation. If it gets way too far in front, you may feel you have to catch up to it, causing you to whack at the puck instead of properly loading the shaft
5) Make sure you are really cupping the puck/closing your blade during both the pull and loading phases of the shot. It makes your shots more powerful and consistent, and it's easier to load a stick when the blade is closed
6) When you release, snap/roll your wrists, so that the toe of your blade is pointing at your target
7) You can shoot like this off the inside foot (in-stride style, with the leg kick with your outside foot) or off the outside foot (classic wrist shot style), it works equally well either way. Regardless of which foot you shoot off of, make sure you have a nice deep ankle/knee/waist bend, and make sure you're really getting your weight into the shot
8) When starting with this technique, I would suggest standing still, facing the boards, and shooting "old school" style (weight transfer from your inside to outside foot through the shot). Once you get that nailed down, work your way up to shots in stride off your inside foot, with the leg kick
I think this technique makes the most out of the whip in your stick, it's REALLY worth trying IMO. Also, you may want to try cutting your stick a bit shorter. If you're only removing 3" off a senior length stick at 5'9", I would personally consider that to be a somewhat long stick, and cutting it will stiffen up the stick a bit.
Here's the video I mentioned earlier (the one that Jarick posted), that goes into detail about shooting off the toe:
And here's Cammalleri, Kovalev and Kessel shooting, you can see that they use this method, and all have nasty shots:
