How can i get super strong for rugby and wrestling?

I do heavy weight training 5 days a week also i do some cardio us wel in these days.
I have started to do rugby and wrestling and even though i lift alot of heavy weights everyone in my rugby team seems so much stronger then me and also in wrestling when i wrestle people they be miles stronger then me.

Why is this and what could i do to get some hardcore power and strength into me.

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