Hmmm..... I am ASSUMING that you are using low end servos, and not much of them. Those don't draw much current, but still, I would do the 2 amp, as that is what I did when I still used nimh. You always want to check if your battery is performing properly. I am also pretty sure that even 4 servos might be able to peak at over 2 amps, as I have tested this with 2 servos, and was able to get one peak at 1.6 amps. I will try to test a few futaba s3003s today to make sure. And yes, a upgrade to life or atleast nimh is recommended, as 3 flights on that battery is pushing it.
Desertlakesfying, I tested my spektrum tuff, and it brownsout at 3.1 ish volts. If your battery is at 3.1 volts, well um, your servos will move very slow, at the least