Glad you like your RBA's tomzgreat. There are many who do.
I played with that route -- and returned to my shi-fu (slant coil spec) atty's and carto tanks.
LOL -- I also sold my Reo's and bought another Vmod.
I'm glad the OP is enjoying her first mod. When the bottle doesn't squeeze right you might have a trapped air bubble. Just take out the bottle and you may see that liquid is trapped at the top of the bottle. Just poke it and it should go down. When I start getting this type of thing happening I give the mod a bath......and it's gone many weeks without needing one. And, I agree, you may also be screwing it in more than it needs to be. It shouldn't be trashing the bottle the way it has.
Your feed method sounds perfect. Keep doing it that way and you won't be needing tons of bottles as you won't be squonking, just tapping.
The shi-fu can easily last a month
or more with pretty steady use. When I notice weakening it either means it's too saturated or close to time to change the battery. Seeing a dark coil does not mean it is gunked up. Once used, it will not go back to it's original look.
There is mountains of data here at ECF on cleaning and dry burning attys. I think I've tried them all and now rarely use any of them but do keep some Vodka around for when I'm inspired to rinse them out. I don't soak them for hours. For me, the shi-fu usually just simply stops working. Also, when new, it can snap and pop and crackle a little bit until it gets broken in.