Instead of blah blah blah, why don't you give it a try NinjaJedi? I've seen some tournament gameplay of CoD4, and it's all on HC. And that's for a reason, the better, more involved players, all agree that it's harder on HC then on regular. On regular mistakes can be made, on HC mistakes mean certain death. Btw, the way I look at it is like this; when you see an opponent, you have to react and aim as fast as possible, if you aim correctly and shoot first, you get the kill on HC, but if you aim and shoot correctly first on regular, you still get the kill, don't you? You've 'started' pumping rounds into your opponent first, so he will die before you will, assuming you're both aiming for the chest/head. But, since it takes longer, you can duck for cover in regular, making it easier to repair 'little' mistakes.
I think your logic is seriously flawed btw, this would be the first time where a higher difficulty level results in easier, less skillfull gameplay. I could understand that YOU become better in HC then in regular, but that's most likely because you don't really suck, have good aim, and thus get faster kills in HC, and die less, because in regular the noobs have more chances of repairing their mistakes, because they don't die instantly. When I played counterstrike, I noticed that half the reason I used to be on top of the charts in any game I entered would be because I had a faster internet connection and a solid PC, pushing 50+ fps all the time, giving me quite the edge over players with lesser PC's and slower internet. I think that's part of the equation as well ...