Is your driving mostly in town and highways?
If so, perhaps look for a tire that has better design for this environment.
I had BFG KO2's for my summer set up previously, and albeit they're nice looking tires, they were not the best in rain, especially heavy downpours and puddling, and even more so at highway speeds in these conditions.
As most of my driving is highway and in town, I switched to Michelin Defender LTX tires and it is a 100% night and day improvement in many aspects.
1) I gained back some fuel mileage as the Michelin's are lighter than the KO2's and balance out much better overall and with much less weight required.
2) More importantly, the control and grip in wet road and heavy rain driving, especially at highway speeds, is incredible. These tires were designed to better resist hydroplaning and provide a much more stable road feel for this application.
As for tire width/sizing. Yes, a narrower tire will cut better through rain and snow/slush.
However, I currently run LT295/65R20 (equivalent to 35's) Michelin's for my summer set up on my stock 20x9 rims and they are flawless in terms of their wet road handling characteristics.
I have zero issues with hydrop laning at reasonable and controlled highway speeds in these road conditions.
However, if I was start flying at excessive highway speeds in wet or heavy rain road conditions, then tires aren't really the only deciding factor. The driver is