Fishing out of Trappers, you should consider the mid-lake reefs or second breaklines offshore. Given the time of year, I’d probably start looking in 13-17′ and adjust from there.
Leech is a different lake in the big basin vs Agency/Walker bay. Those bays are very clear and deep, while the rest of the lake is much shallower and more gin-stained. So in most of the lake, the walleye won’t necessarily be in that 25-30 foot range (though they will likely be so in Agency/Walker bay).
For tactics near where you’ll be:
Northerns and walleye can probably be found pulling cranks over some of the mid-depth bars near pelican island or over shallower flats at sunset.
-If there’s wind, work the windward side of any points/bars.
-Boy bay is shallow-plenty of pike,
-Consider the islands or potentially stony point/ottertail if nothing else is working.
-If all else fails, the bite directly above/in emergent weedlines should get some action.