Welcome,Beaver are indeed real nice right now.I am north of you in Minnesote,our northern beaver are in good shape ,sometimes till early may.
I use all 330s in my beaver taking.Castor mounds of my making are my main set.
If you look down a bit,you will see a photo of one of my castor mound sets.The posting has over 2500 hits.
I use cable attached to my 330s,I stake with a 24 inch x 1/2 inch rertod stake.
I did 3 demos in illinois last fall,but I cannot remember if your 330s must be totally subnerged or only 1/2.To many demos---to many states---to many different regulations.So please check your laws regarding 330s.
As you have more questions,just ask.
Tom