Hey Strelm,
The Kev fuel mod is pretty cheap (for the results it gives) and easy to install - so I definitely recommend that option along with the DNA filters. You'll get a total different feeling bike from these relatively easy mods. But also, if you want more bottom end power, you could change your gearing by putting on a bigger back sprocket or small front. A 47t rear sprocket made a world of difference to my bike. Again pretty cheap to do in the scheme of things.

I have no idea why you'd need to block the AIS - especially if you've got standard pipes. That doesn't translate into power gains as far as I understand - just stops it popping so much.

And yes I agree it sucks that you have to mod the bike at all as it should be right straight from the factory. But it is fun to tinker...