Hello again,
I truly suggest that you abandon that base and move to another location.
Seriously, what you describe is a LOT of heat.
Torches cause more heat than candles. Construction causes heat. Killing zombies used to cause heat, not sure now.
This sounds like an escalation of commitment or sunk cost fallacy. Forget the time and materials you spent on the base.
Being overrun is part of the original design of the game. I can't say that it is designed that way now, but it was and may return to that someday.
Whatever it may be, if the neighborhood goes bad; move.
From one survivor to another, good hunting and keep your head down.
Patchup.