More than 2 years ago I was persuaded to buy ASCPro by a friend as it was guaranteed to give a smooth meter, which it undoubtedly did. But in the intervening years and after paying the renwal fee for the Pro version, I have found it less and less effective.
It is still on my computer and I run the deep scan weekly.
A while ago I found via google the license keys for a FREE upgrade to the Pro version, which is what u need to get all the benefits that may improve ur meter, and clear down all the background shite on ur 'puter.
At the end of the day though I believe a top notch processor, graphics card and maximum RAM is the best solution.