Battery Charging - Help Please

I hope it's ok for me to post questions like this in the forums here. I haven't really searched for general forums, but have found some helpful answers here.

I've recently purchased 1900mah and 3300mah batteries. I have a piranha fast charger that didn't come with a whole lot of instructions. Actually it came with two lines of instruction that didn't offer a whole lot of help.

It tells me...

1300-1500mah -15-23 mins
1700-2000mah -28-33 mins

The needle when charging a 1900mah pack, at 30 mins (2 15 min cycles) is still within 3 to 5, and batteries last about 10 mins in my stock traxxas rustler. Are the batteries fully charged when those 30 mins are up... or should I charge a third cycle til needle on the meter hits 0?

It tells me also to discharge to 1.5 on the meter... before charging a battery. this is why I ask about charging to 0.

with these 3300mah batteries (still waiting for them to come) should I charge them 3 cycles? (45 mins fast charge) ?

Sorry for all the questions... much thanks for the help in advance.