Josh, I have used also the function Minimize[] by fixing 6 or 7 arguments and minimizing the function f[] on the rest of variables and succeed to find the following local solution:

In[1]:= f[6.171439493048681`*^14, 2.3506806096409836`*^13, \
0.16717122698568856, 1.0555557671120848`, 2.9971, 1.3111, 0, 0]

Out[1]= 20784.9

I have fixed some variables and used Minimize[] for the rest of variables... Unfortunately, this is all I can do for the moment!

Apropos, Josh! You have done a mistake in writing argument of the function f[] in FindMinimum[]. The last but one argument must be dfr2 not drf2.

Consider

Solve[{3 x^2 + 4 == 0, 2 y - 2 == 0}, {x, y}, Reals]

which just gives you {}. Did it not find a solution? Is there no solution? Is there just an error in the code? You might not know. (For such a simple problem you can look at it and know, but for your much more complicated system you probably can't look at it and know if there is a solution or not) Solve can only give you a solution or {}, or an error message if you really mess up the syntax.

Consider instead

NMinimize[Norm[3 x^2 + 4] + Norm[2 y - 2], {x, y}]

This might tell you more. It can tell you if it found something very close to a zero minimum. Or it can tell you the smallest value that it found and where it found that.

Using Norm avoids things like a positive first equation plus a negative second equation giving you a zero minimum. And it avoids the issue of complex numbers appearing in complicated equations. You could just square things, but what happens if 3-5*I appears in your equation, what is the square of that?

If it gives you something very close to zero then that might represent a solution. But if it gives you a non zero minimum then you might want to think there is no solution to your two equations. There is always the issue of local minimum that you have to think about and that there might be a zero or almost zero minimum that is just very very hard to find.

My hints were intended to get you to think of all these things yourself. Does this now give you some ideas how to proceed?

Perhaps there is no solution in the reals.

Could you use NMinimize and Norm or something similar and test this?