hello

1) with toplace pieces i never had that problem, i always order 70-75 % density and the hair is always equally spread/distributed(?, whatever)
2) same again, never had a problem with the first attachment with toplace pieces, and i dont wash them before attaching, but maybe this helps.
3) this seems to be a french lace issue. it takes me 5, 6 attachments to cut these ripples/wrinkles out, i mean to cut the lace to its prefect size. (stock pieces)

hope that helps