Wall of text incoming, brace for impact
Scorch is cool.
In a cruiser you can get like 24km/30km optimal with Scorch which is huge.
In a frig it's also nice. You get 17km with MPLs and perfect skills before you start sticking stuff to help your range on. This means you can in theory fly around stuff shooting it while you lol at it's attempts to snag you and shoot you back.
Range isn't ever negligible in a frig btw.
People also use webifiers to keep you away.
Therefore if you cannot effectively deal damage at 7-9km and the other dude can hold you at that range whilst hitting you, you're going to lose. A fair amount of ships are fit up like this.
Also don't make the mistake of thinking the EFT DPS figure is what you're actually going to get. That's
gross DPS.
Range, tracking, resists and target size all mitigate against it in the real (internet spaceships) world.
That high figure you get with conflag is vs. a big stationary target at zero range.
A target out of range, with high EM resists or burning around you faster than you can track is going to be taking a lot less damage.
It can get really mathematical if you go into a lot of detail.
Guides to the gunnery damage formula here:
http://wiki.eveuniversity.org/Gunnery_Guide
http://wiki.eveuniversity.org/Turret_Damage
Handy thingy for making a graph of your logs here (if you want to see what happened to your deeps when you switched crystals etc):
http://www.eve-log.com/log.html