If you're thinking about switching, make sure to spend some time reading the stickies on the LB/L forum to familiarize yourself with the approach over there. It's a fair bit different, and a bit less flexible than prozinc, but it does seem to produce steadier results and may let you increase the dose more effectively without giving Phoebe those steep dives that she likes to take from time to time.
Also consider when you might have some time off work and can do more testing as you'll need to test a lot during the switch.