For example i had Speed Pro 2022 strung specs (330 gr weight, 326 SW, 32cm balance) and now play with Speed MP with some lead added, strung specs (327gr weight, 330 SW, 33cm balance). I always thought that weight and swingweight makes racquet easier or harder to use. But with Speed MP even with higher SW and even balance i don't get tired as much as with Speed Pro. I think it's all about beam thickness and how tight is the stringbed, which makes racquet easier/harder to use. What do you guys think?