chop centre of plant out before flowering ?????

whats peoples views on chopping the centre of the plant out near the top to help increase yield.

my first crop and upto now pretty happy. 4 plants under 600w in soil, have a slight issue with some yellow leaves at the bottom of each plant starting at the tips and turning a little crispy. most of the plant looks healthy and a nice colour.

also the biggest plant seems a few days infront of the smallest and trying to even them out before flowering
 
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