cannons don't need to be light when carried in wagons, cannons light enough to be carried on horseback and still be powerful enough to really wreck many people's day are cool.
Yes they had plenty of Han soldiers, but they didn't basically continue the the Ming Army, indeed they devised the Banner system which placed Manchu at the top and they were cavalry focused, cavalry only later declined when it became clear that gunpowder had reduced their role substantially.