Yes, that's a good idea to try mixing them...luckily the flavours I picked are fairly similar so would mix well.
As for the remainder of the bottle- 11% of it is oils like orange, nutmeg, tobacco absolute, ginger. 4% is alkaloid, 0.5 is trymethylpyrazine, 0.5 is acetylpyrazine, 1 is methyl cyclopentenolene hydrate, 1 is ethyl maltol, 1 menthol. Other than the oils I don't really know what they are or what their purpose is. Does it sound like it's bad liquid?
Hm... that's a fairly extensive list. Do you have allergies? Such as seasonal or food? You could be reacting to one or more of the flavorings. In addition to or instead of or some other combination (allergies are such fun... I have them... yay!... not

) to the base liquids. Which are just the plain liquids that everything else is added to. That's the PG and the VG (and in rare cases, another one that I think is abbreviated as PEG?).
If you have a vape shop nearby, you could get drop by and get some very, very plain liquids. Small bottles, not a ton. Even unflavored. Try, say, a 100% PG without any additions. A 100% VG with nothing added. Then move "up" from there. Simple flavors with very few flavorings.
If it's an allergic reaction kind of thing, it could be a real pain to pin down. But jumping into a complex flavor (tasty as it may be) can make it hard to tell what could be causing what.
And I don't know any of what's in the list up there makes a "bad" liquid. The chemical names of ordinary things sound kind of scary.

I was just recently making jokes about the "dangers of dihydrogen monoxide". That's the chemical name for water.
(Hey, it is dangerous! You can drown in it!)
One thing that did occur to me this morning is that in smoking, we all inhale into the lungs as that's where the nicotine is absorbed. In vaping, it's absorbed in the mouth and nasal passages. I had to change my inhale to more like a pipe or cigar. Took a little while to shift years of habit around that way but not long. If I inhale any vapor like I did the smoke of a cigarette, I try to cough up a lung.
The positive side of having to shift that habit around is that the lungs don't have taste buds.

That is, the best way to do vapor inhalation is the way you get the most taste. Read this article and see if applies in your case:
[url]http://www.e-cigarette-forum.com/forum/ecf-library/337017-inhalation-technique-e-cigarette.html[/URL]
If I'm getting any vapor in my lungs these days, it's small amounts inadvertently. And I was used to inhaling tobacco smoke deeply. So much so, very little smoke came out when I exhaled. But the thing is, I read the base liquids which make the vapor (and flavorings and nicotine are suspended in) can "coat" the membranes some. Which might explain "heavy" feelings in the chest if you inhale them repeatedly into the lungs.
Now, they are non-toxic and recognized widely by every health agency and regulatory body around as safe. But breathing them into your lungs a lot could easily cause a "heavy" feeling. Maybe even an "achy" kind of thing.
So first thing, don't inhale into the lungs like a cigarette. Do more of a cigar kind of "puff". Draw into your mouth, hold a little, taste the vapor, blow it out. Many (myself included) exhale through the nose. That may mean I'm getting some in the lungs but nothing I've noticed. No coughing, no "heavy" feelings. The nasal exhale gives me more taste (smell being a big, big component in the sense of taste) and picks up some more of the nicotine.