PNG8 exports - removing ugly white/black outlines?

Hello Photoshop friends,
so I have a PSD with layers. I run an export script to export all layers as PNG8 because I want to preserve transparency. The file size with PNG24 however is far too big for the web although supporting alpha transparency. Upon export, I get an ugly white line stroked around every image. In my export script, I don't have the option to fix the matte colour of the export image to the BG colour of the webpage so I'm wondering if there's any way to automatically or manually remove this transparency area which renders fine under PNG24 but poorly under PNG8 and GIF formats? Anyone have any experience with dealing with this problem?
Thanks.

Ok thanks a lot - that clairfies the matter. Another related issue that you may be able to help with:
I'm running a batch job which produces a PSD with layers at the end that I intend to export as seperate files. At the moment the action calls an export script to produce the PNG8 files. For each batch item I can manually select unique destination folders from the script dialog box. The script isn't that sophisticated, so it doesn't support the matte or transparency switches in the SFW dialog box which, from your advise I now require.
I guess I could cut the export script from the action and replace it with SFW actions with my desired transparency/matte options but then I think I don't have the option to choose a unique destination folder for each item in my batch job. I'm unsure how to hard code the export script to toggle the options that I require. Is there a way to choose unique folders within the SFW dialog box on export for each batch item under this circumstance?

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