Inner turmoil does not prove bondage of the will. If a mother is struggling to decide between spending money on medicine for herself or food for her children, is that a sign of a bound will?
Rom 7:18
For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will (θέλειν: present continuous infinitive, therefore, to keep on willing) is present with me; but
how to perform (κατεργάζεσθαι: present continuous infinitive, therefore, how to keep on performing) that which is good I find not.7:18
οἶδα γὰρ ὅτι οὐκ οἰκεῖ ἐν ἐμοί τοῦτ᾽ ἔστιν ἐν τῇ σαρκί μου ἀγαθόν· τὸ γὰρ θέλειν παράκειταί μοι τὸ δὲ κατεργάζεσθαι τὸ καλὸν οὐχ εὑρίσκω
Paul is not saying he has never been able to do any good, but that he has not been able to keep on doing the good he was willing to do, hence he has fallen into transgressing the law and condemnation.
So, firstly, his will is not bound because he is able to will to obey God's law. And secondly, even if we take your definition of a bound will as being prevented from doing what one wills, Paul was not prevented from doing all the good he willed, but only some of it.
If a donkey is tethered to a post so that it can do its will of eating what is within its reach, but cannot do its will to eat what is beyond its reach, its will is not bound. Its body is bound. Its will is free to keep on willing to eat grass in the next field. It just can't reach that field.
Your definition of a bound will is logically incoherent.