So I went back to the Bunnings and checked all the display drills' chuck. Here is my finding:
1,Ryobi, hiend BS model is very good. But lower models are not that good, just like mine.
2,Green Bosch, all the display models are no better than Ryobi.
3,DeWALT, worse than green Bosch. Big surprise to me.
4,Makita, very very rigid, almost no play.
5,AEG, second to Makita, better than all others.
So I returned the Ryobi 18V set and swapped for a AEG 12V set for a little bit more budget. The reason I didn't think about a 12V is afraid it might be too weak. But it turns out the AEG 12V drill has 40NM torque which is even 2.5NM more than the Ryobi 18V. (Of course a higher end 18V would be higher than 40NM.) And I did some drill test back to home and can confirm this 12V does feel almost as powerful as the previous Ryobi 18V which is rated at 37.5NM.
It's interesting to know the build quality variation across the brands and that a good 12V could be quite powerful enough. :D



