Something must have been amiss with your boga grip. As someone who fishes the Davidson often and with good success, I have to say that a large number of the 20 inch fish I catch there are quite rotund...and certainly more than 3 lbs.
However, at the end of the day why does it matter whether or not you know the actual weight? If the fish was 5 lbs in your mind and you don"t receive any criticism for claiming such, then more power to you!
On that note I will conclude my annual fishing forum diatribe. I hate hyper-analytical forum members so I will hereafter cease my rant.
And nice report, miller! Keep slaying "em out there! http://allyslot.net/