Besides Churchie none of those games were a grind. They comfortably beat all those other teams. If they continue getting heavily penalised it will cost them in tight games.
The Christchurch game was Nudgee's best game this year in my opinion where they came from behind to win in the second half. Nudgee was also struggling in the first half v Ipswich, TSS and Churchie but their fitness and discipline in the second half, and/or the final minutes of the first half managed to get them into winning positions. I can't see any team winning against Nudgee unless they are up by at least 10 points into the second half. Churchie gave it a great go, but the 3 points they were up into the second wasn't enough to get the across the line, even with a referee finding technical issues at the breakdown on the try line with the attacking team rather than with the defending team.