[Emp not working correctly]

So I have been testing out EMP towers and have run into a problem. I set up a launcher base 300 blocks from my emp tower, which was fully powered and linked to the radar and a siren. I launch the missle, the radar actiavates the siren and the emp tower fires, but then a few seconds later the missle hits anyway and destroys everything. any ideas? radar set to defult.

[Where should i get my Tekkit Classic server hosted?]

I am running one on a personal computer at home for me and 5 friends. It has dual core 2.8 GHZ and 8 gigs of ram. In less then a week my computers CPU can not keep up. Though, when I installed 4 more gig of ram I did stop getting Overload messages.

[Lag Heavy Blocks]

I have noticed as soon as any block that keeps a chunk loaded lag started on mine. I'm pretty sure quarry's will do the same thing.