Great advise!! you certainly know your stuff (just wish i did)

The story is..... I purchased the tripple chrome plating kit which cost a fair bit, and to date i have not completed an item yet with any sucess, tried nickel & piece came out cloudy with black streaks in places

copper is not playing ball either!!
Im yet to mix the chrome crystals as i cant even get the required finish on the first two,the main problem is the surface area,i find it extremely difficult to work out the sq inch of items even after advice from on here & in the manual,still can't crack it so everything i attempt is just guessing at amps - hence the poor results.
At this stage i feel like giving up and selling the lot but chemicals are mixed and i would lose too much money, i suppose its just a case of practice practice practice,but every failed attempt is a kick in the guts for me.