Ralph,
If you lift the 410 up, curl it to the desired angle, then just push the SCV forward quickly, you should feel it pop into the "float" position and watch the loader drop relatively gently. If not, you have a problem with the SCV or...? Definitely have it checked out. I can't count the number of times I've floated my 410 (and now the front blower). The pop, or snap, as the stick goes into the float position is easy to feel.
I've picked my front tires off too, but never when I've snapped into float.