I have had a level 6 Tent now for 8 days and only just got my 4th Brazier. 4 in 8 days, despite collecting every opportunity.
I am using all energy to chop rocks and I am on target to meet the 3200 goal but at the current drop rate I am getting, there is no way I will be able to level up my tent as I need another 6 braziers and at the current drop rate that will take another 12 days.
I have a level 36 account too which has no problem getting braziers. This is all down to the luck of the random drop factor, unfortunately.