i using vt70 with BG80 power, and i felt i need alot of strength to hit the shuttlecock and hard to control. After i saw other people post about the string, i get blur too...any advice? Thank you
Agree with above... it's possible that this string might require a lower tension than your previous string.
The actual number of your tension is irrelevant. If the string brand is the only thing you changed, and now it's harder to find strength, then the reasonable options are to lower the tension with the new string, or simply go back to your usual string.
In all honesty it may be because BG 80 is a hard feeling string that hold a fairly good tension. String is all about preference, a lot of people like the hard feeling strings although other do not such as myself. I find that BG68ti is a nice feeling string as well as BG 66 You need to remember string and string tension is all personal preference