Hi Plingle,
Both LOTW and Rainy can be absolutely lights out in September. September/October are without a doubt my favorite big fish months for Walleye/Pike and Crappies. Smallies also really get crazy on deeper reefs with the dropping lake temps. I often like to run combo trips in which we fish walleyes for part of the day, and chase slabs for part of the day.
We will be holding our In Depth Outdoors/Rainy Lake Houseboat excursion in the Middle of September, and although last year we had a “HEATSTROKE” we absolutely punsished the 20-25 inch walleyes. Shortly afterwards the water finally had the normal fall cool down and the big fish were in a frenzy.
Let me know If I can help answer any other questions.