From experience ambient temperature can have a significant affect on the bend quality. I see you're in JHB and I can bet it's pretty damn chilly there this time of year, maybe try each type of counduit at a warmer temperature and see if it helps. I'm not sure how you could do this on site however so it's a bit of an academic exercise but I guess you could friction rub the conduit to warm it where the bend is going....
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