Clutch Slipping (New Clutch)

[top_driver]

i bought a new clutch that cost me nearly 600 excluding labour (i should have done myself) from the start it was sort of noisy i did the run in period, 500 miles. and more so not hard driving. but what i find quit puzzling is that if any power is put into it, it slips like a clutch that is old an worn (replace kind of worn), this is a stage three clutch. is there an easy solution, was the clutch put in wrong, any ideas?

[top_driver]

hahaha, i'm wholly confused, haha