I think Dale or Rory could be of much greater help here, but I'll throw in my .02 cents.
First, congrats on the drop in ET. I have the same issue as you. My fastest ET so far is 11.51 @ 119 (2 years ago, the last time I made it to the track). But I see many cars in the very low 11's with my trap speed.
Typically, dedicated race cars will go beyond peak HP rpm in the traps. As it is, you're shutting off right at the moment when you're making the most power. That's leaving some good power on the table. I'm no pro, and I'm still figuring out a lot of things, but I think typically guys will run at least 500-700 rpm past peak, maybe more. So more gear will help on the line, where your greatest ET drops will be had, and you'll be getting the full use out of your peak "band" on the top end. HP numbers usually taper off slowly at peak, unless the valvetrain can't handle it. That means you're still making good power past peak. That's good usable power.
The problem is, of course, with more gear, it makes the car that less streetable. So now you're looking at a decision of do you want to squeeze every last bit of ET out of the car, or keep it somewhat streetable? This is why I bought a Gear Vendors overdrive, so that I can add some more gear and still keep it streetable. I just haven't gotten it installed yet. I'm waiting to make that change once I put the new engine in.