neck warp

I am worried that my 5 string might develop a neck warp from the 2 upper strings, both respectively having greater tension than the 2 lower strings respectively, summed up pulling at slightly above 3 lbs greater tension than the 2 lower strings on the neck. Is this a real concern, or is it...

I currently own a Sterling Subray 4 which I'm happy with except for how much it weighs. I recently went to a bass store and I fell in love with the Ibanez 300 as it feels so comfortable in my hands and it's very lightweight. I've also been wanting a 5 string for a while, so now I'm thinking of...