Welcome to GTA Jim,,, nice to have you with us
Congrats on the new Whisper. You checked the trigger correctly and sounds like you did in fact get one of the "older" ones,,,,which is a good thing. Do yourself a favor and order one of Bobs triggers,,,, you simply will not believe the difference it will make. It's extremely easy to install and will increase you accuracy by leaps and bounds as well as increase your enjoyment of the rifle.
Another thing,,, do yourself and your rifle a big favor and DO NOT SHOOT those gold colored "PBA" pellets that probably came with your rifle. They are much to light and can actually damage the internals of your gun. Also make sure you do not use any "powder burner" firearm solvents to clean the barrel. To clean the barrel all you need is some cleaning patches, a length of "weed whacker" nylon line and a bottle of "Goo-Gone" which is a citrus based cleaner available at most good hardware stores. Clean the barrel real good and you won't have to clean it again until accuracy starts to suffer, which will take quite a bit of shooting....
I'm sure other members will chime in and welcome you to GTA. If you have any questions just ask, the members here are more like family than just forum members and they are always willing to help out a brother airgunner

Again,,, welcome....
Jeff