What flavor manufacture are these flavors from? (TFA, HAngsen, Inawera, FA, Capella etc...) Not every manfactures flavor taste the same or use the same percentages.
VG heavy mixes not only require more steep time but will also vape poorly with little vapor or flavor if there to thick. Did you add distilled water to the mix to thin it? If so how much?
Caramel - Turkish - cheesecake - vanilla - strawberry cream - all need steep time of 2 - 4 weeks. The others 1 - 2 weeks. If you combine the for mentioned with the others then 2 - 4 week steep time would apply. There are ways to speed this process in my blogs below.
This may be a lesson learned but when trying new flavors or recipes always make 10ml test samples. As you learned the hard way anything more is a waste of good material. Once you've perfected the mix then make what ever size you like.
It would seem further research would be helpful for you. May I suggest the following:
My blogs will give insight into all aspects of DYI, from steeping to what supplies to have on hand to a basic walk through mixing your first E-juice.
E-Cigarette Forum - dannyv45 - Blogs
Then read hoosier's blogs. These blogs concentrate on fine tuning your mix and give insight on additives.
E-Cigarette Forum - Hoosier - Blogs
Then read Boletus's blog's. These blogs concentrate on formulation of nicotine bases regarding proper calculations methods for figuring Nicotine concentration as well as safety.
E-Cigarette Forum - Boletus - Blogs
Then read Ginger's book "E-Cigarettes 102: DIY E-Liquid". It is a book which I've contributed to that delivers an in depth easy to follow guide in the art of DYI.
E-Cigarettes 102: DIY E-Liquid
I recommend viewing VPLive Vape Team Episode #82: DIY Safety and bookmark it for future reference. It explains safety in all aspects of DYI.
VPLive Vape Team Episode #82: DIY Safety
then read the stickies at the top of the page.
this will explain a lot of the how's and why's.