where is it aprox? like which cross string at which main string is it at? after 2 sessions i still cant really find it, before it felt like it was a bit higher up then other racquets. 2/10 smashes aprx i say i'd hit it but i still can't figure where it is, i only know i hit it because of the pok sound produced and the increase in power.
As Mr Chickenpoodle said, hit with you palm or another racquet head. Listen carefully. Start from the center of the racquet (it is usually inside of sweetspot). The pitch and the laudness will change at about top 2 to 3 strings (depend on string tension). You should notice it without too much problem.
Or did you put too high tension on your ns8k? Did you increase the tension from your normal tension of string? Did you go to a different stringer?
everything affects the sweetspot. the string's diameter, tension, string pattern, maybe even stringing technique and material of the string. theres no real "position" of the sweetspot on any racquet, but there is the general location of it on a particular model of racquet, simply due to the shape of the frame... i'm not talking about just iso vs oval, but everything else too regarding the frame. i'm pretty sure theres other things too that i'm not aware of.