100 cfm more with anular and downleg boosters can't beat AFR

Also some other things to think about. What voltage does your ignition unit see while its running? Make sure its at least 13.8v
What's the resistance of the plugs you use. If they are 0 resistance then check them and make sure they measure 0.5 ohms at most otherwise they are no good for what you're trying to do.
Same with the leads check to make sure they are all good and have similar resistances.
Grab a spark tester as they are cheap and see what every spark plug gets

Lots of cheap stuff to do to improve what you have.