May have too many plants in a small tent. Should I attempt to grow them all, or cull the herd?

That is such a hard decision... I know I've told you to prepare for a jungle - and you should - this is going to have to be your decision - but why don't you wait until they're bigger and you can see what they become? Look at it this way... let's say you pitch one plant today but in 4 weeks time, you realize you COULD have fit that 3rd one in and been ok... or in 4 weeks time, one plant dies of its own accord because of X, Y or Z and now you're left with only 1 plant... Stick it out until you can't stick it out any longer... You can do this! You really can!!!