using step sequencer to trigger Addictive drums causing massive clipping

A MIDI editing tool like the step sequencer is not likely to cause clipping. It might be helpful to describe your setup a little more fully, starting with the audio interface configuration. Are you using a dedicated audio interface or the internal PC sound chip? Looking in SONAR preferences, what are the driver mode and latency settings. A little more about the audio failure might also help, is the sound distorted or are notes not being played back?

Is it possible that its because the VST manager is showing the 32bit plugin for AD and I have a 64bit os?

wherewithal
Is it possible that its because the VST manager is showing the 32bit plugin for AD and I have a 64bit os?

I don't think so. The OS does not matter but the host might. You should run the AD designed for your host. IOW, if you are running 64bit SONAR run 64bit AD. There is no reason to run 32bit plug-ins in a 64bit host unless the vendor does not supply a 64bit version in which case it is time to look for a replacements.

AD2 outputs VERY "hot" (aka: loud) for some dagned reason.
 
In the Console View select ALL the active audio output tracks that are accepting signal from AD2 (in Sonar they are called "Instrument" tracks), hold the Ctrl key on your keyboard (QWERTY keyboard that you type with... not your MIDI controller) and turn down the "Gain" knob of one of the track strips (this will be at the very top of the track strips). The gain knobs for all the selected tracks should turn down simultaneously.
 
Alternatively you could do the same thing in the Track View by selecting all the same tracks as before, holding Ctrl and lowering the Gain slider control on one of the track's (you will need to have your "Track Control Filter" set to "Mix" to expose the Gain slider).
 
You could also turn down the volume faders inside AD2 as well so they don't output as "hot" but I usually just use the Gain control in the Console view.
 
If you are expereincing WILD level fluctuations though this would be due to your "Velocity" settings for each Step Sequencer pattern so read up on the Step Sequencer and how to adjust note velocity levels.
 
It could also be you have manged to accidentally insert some kind of Volume/Gain envelope on the track somewhere that is turning the volume/gain up and down in an undesirable fashion... but that probably isn't it.
 
Cheers.

adjusting the velocity settings did the trick, I also didn't do the best job in preferences setting up the focusrite now that I review it. Thanks so much everybody. I'm sure I'll be back.

As far as velocities go, it makes sense to me to use the ranges found in the AD libs when creating your own patterns.