Malcolm McLeod
Member

A significant factor is the thermal mass contained in a conditioned space: how much 'stuff' do you have; how many BTUs does it contain; and how fast...

A (electrician's) step drill makes a good poor-man's substitute for a tapered ream.

Flame color would lead me to believe your gas supply may be a bit sketchy. Might warrant a call to your utility. As for condensation, water vapor...

Take a look at the 'Ultra filtered' offerings (i.e. Fairlife brand is one in my area). It is expensive, but it's 'best by' dates are usually...

Where are you located? ...might have a mortice loaner? Depending on timing and your willingness to go powered.

For the USA incandescent bulb users, you might want to check what happens in Aug '23.