I agree! Mo' front brake! This is how I've been taught:
The front brake is responsible for 70% of braking, and the back brake, respectively, 30%. That means, if either brake is used to it's MAXIMUM, those brakes can provide that much braking power in ideal situations, while the bike is neutrally weighted.
However, as soon as you use the front brake the weight of the bike transfer forward, putting all the weight on the front tire, squishing it down, and making it a much more effective brake. I would say that you can get almost 95% of the braking from the front when riding hard, just because you're rear tire is so damn light under heavy braking, using the brake on it is pretty much worthless....
I don't use my rear brake unless there's hazards on the road - sand, water, snow, ice... In that order, the closer I get to ice, the more and more I start using the rear brake. Why? Because recovering from a rear-end slide is pretty darn easy. However, trying to catch a front tire that's washing out is next to near impossible for less experienced riders. You'll be down before you realized your front tire is sliding.
There's TONS of info on this, but for now, unless you're stopping on sand, or are riding in rain, forget about your rear brake.... When you brake, shift your weight to the back of the bike. However, even you don't, unless you place your weight over the front of the bike, you won't get the 250 to pull a stoppie. Yes, it's doable, but you have to work at it. Also, it's quite difficult to lock up the front tire of the 250. Yes, I've tried, yes, I've succeeded. It's not easy.
What I recommend for you to do is go to a wide open parking lot, and either pick markers or brings markers with you. Pick a speed (25mph), accelerate up to 25mph as quickly as you can then brake AS HARD AS YOU CAN to a FULL STOP (feet down 0mph). Then decrease that distance by 2 feet the next time around and so forth. Then do the exercise at 40mph. Start easy at first. Then add more and more brake. What you are doing through this exercise is teaching yourself the limits of the tires, in this case, enforced by the brakes (as opposed to speed through a turn). I can hustle my 250 down from 25mph in about 10ft. 40mph takes 30ft. Using just the front brake...
You will be surprised at how quickly you decelerate and how much there really is... Please pardon the long response, I just prefer to give thorough answers. I hope this helps you. Ask the other guys around, I'm a verbose bastard!

Keep the rubber side down!