I lost my snap--where is it?

I have a 2002 KDX 220. The first couple of times I rode it (when it was bone stock), I could lift the front wheel easily in second (and even third) gear merely by twisting the throttle.

Since that time, I've put on an FMF rev pipe and removed the airbox snorkle (just the snorkle, no drilling or anything). I've also put on stiffer fork springs.

Now my bike seems to run great in almost all respects. However, it won't lift the wheel on flat ground like it used to (I still have no trouble lifting it off of whoops?).

I'd appreciate any advice as to how to get that wheel-lifting snap back. Here is a bit more info that may be helpful:

-- Jetting is stock (I assume that it's probably rich, but it seems that, if anything, it should have been "more too rich" before I put on the pipe).

-- It's probably about 40 degrees warmer when I ride now, than it was when I first got the bike. I've been riding at the same altitute (about 3000 ft.).

-- I'm not great with a wrench, I've never taken a carb. off a bike by myself (I'm sure I could get it off, but I wouldn't know what to do with it once I had it off). Thus, if air screw adjustments could help (even if not as much as jetting changes), I'd appreciate tips.

Thanks, in advance, for any advice you may have.