I do not have the Curtis model, but I did have a homemade one (by me) that I used on my 4110 for 3 years...I will give you my opinion if you want it...
The FEL plows makes the tractor very long, and hard to maneuver in smaller places-of which I had some to do. That plow stick out further than the bucket, especially when it was angled.
MANY times, when the snow was wet, I would not be able to steer without the use of the split brakes, which the 2305 does not have. And if to much snow got in front of the blade, the front wheels would come up off the ground and the back wheels would just spin. I also think the 2305 is several hundred pounds lighter that my 4110 is.
This past summer I sold the FEL plow to a fellow with a 990...and I bought a older 380 plow from the x55 series tractors-man that thing is built! there is nothing light duty about it!
To sum it up, I do not think the FEL blade is a good match for the 2305, due to the weight and the lack of steering brakes.
Please accept this as my opinion only-based on my experiences alone.