Hey, I've been playing badminton recreationally or a couple of years and seriously for almost 3 years. I've been using the voltric 7 for quite a while now. I just recently tried out my friend's 3u voltric z-force ii. The feeling was great! The smashes were significantly harder, clears ands high serves felt more solid. The drop shots were easier to control. However, I felt twice as tired than normal and my stamina is not that great. Even though the smashes were satisfying, each one drained a lot of energy. So should i go for the z force ii or something a bit lighter such as the voltric force?