I'm using Yonex RDX500 which is 310g as stated on the racquet, unstrung I assume. The shop didn't have 4 1/2 grip size so they gave me 4 1/4 with a heat-shrink sleeve added. It was lighter than my previous racquet RD power 10 so I added heaps of lead tape to the head. Then I felt the grip was still too small, so I added some duct tape onto my grip. It played fine all this while 'cos my friends were of similar level as me. But recently, I've been doing practising with a much better player and I realised I couldn't handle the weight of the racquet under his barrage of shots. So I weighed my racquet in my lab and it was 400g! I removed the duct tape and lead tape and it still weighed 370g. Is this an average weight for a strung racquet? How much does a set a strings weigh (I'm using full bed of SPPP)? What about replacment grips and heat-shrink sleeve? I'm really surprised by the extra weight. That's heavier than most pros I believe. Or are theirs weighed unstrung?