Thanks for all the tips and information guys. I did pick up a box of the AIM stuff and will see how it shoots. It looks like hell compared to other plated stuff that I have used (which looks like jacketed - ooooooh shiny!) but if it doesn't affect accuracy then I'm ok with it. Talked to a couple of guys that I shoot with last night after I started this thread and they swear by the stuff so it should be fine. I will keep all of your leads on other plated bulletts in mind, much appreciated.
Sounds like the imperfections are caused by impurities in the lead, which makes sense as the rumour is that the stuff is made from recycled material. But for the $91 (tax in, that's $80.53 no tax) I paid they should do just fine - especially for IPSC.