Yeah it's hard to compare some years with different rules or talent spread too thinly when they expanded and teams were getting hammered. I excluded playoff matches given those would on average be vs better defenses.
None of the Bulls teams from their 2007-2010 run made it either. One unusual one was the 2009 Crusaders sneaking into the playoffs with just 17.8 points per game/231 total, 2nd lowest that season only 18 more than wooden spooners the Cheetahs. The Waratahs in 5th also only scored 241 and lost out to Crusaders on points differential by 4.