Since DST is coming soon...it there a secret way to make my timers operate at the correct time. I find the Dawn/Dusk settings just won't work properly.
The WM100 has had issues with dusk/dawn timers since it was released - and the developer doesn't seem all that interested it fixing any of them. Couple that with the lack of a battery-backed clock and/or any way to automatically sync the time from the Internet, and the unit has a lot of shortcomings. That's why so many people (here on the forum, at least) have given up on using it as anything other than a glorified remote.
My guess is that you'll probably need to sync the time from your phone/tablet again as soon as possible after the clocks change. That would probably give you the best chance of success.