Do NOT snake the line!

Your pool can run just fine with 4 jets, but if you break a line -- VERY possible -- you've potentially got a difficult and expensive fix that will shut down your pool. Pool lines are NOT usually run with DWV fittings that can be 'snaked': you can break them, or get your snake totally stuck. Also, both flex PVC and black poly have been used for pool piping: some snakes will go right through that piping -- NOT down the hole, but THROUGH the sidewall of the pipe!

BALANCING THE FLOW IS NOT A CRITICAL ISSUE! YOU ARE TRYING TO FIX SOMETHING THAT ALMOST CERTAINLY DOES NOT HAVE TO BE FIXED!

If you want to tackle this, do it this fall . . . unless you are ready to shut the pool down for the summer.