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I presume you mean the boils are occuring on the inside of an earth-retaining wall. If so it sounds like someone has tried to waterproof the basement and done a poor job. This is often a problem when people try and use a cheap "cellar paint" rather than a proper tanking slurry - or where they do...

Unless you re-render to full ceiling height the damp will probably rise up over the render. You really need to do something to stop the damp rising - i.e. a new dpc of some sort. Options would include: 1) Chase out mortar and insert a new physical DPC - easy for short sections (less than 1...

They've been pretty much discredited. The BRE guide to "Understanding Dampness" refers to a BRE report from 1930 which found them to have no useful effect in controlling rising damp. I've certainly seen a few properties myself in which they were failing to control dampness.