Way to influence Jiyva's attributes changes

[Sandman25]

Is there some way to influence how Jiyva modifies character's attributes? I am Ds with Str 39, Int 7 and Dex 7, and that is while I am wearing +3 Int and +3 Dex armours/rings so it is 39,4,4 really. I use Demon Whip (80% Dex weight), am about 30% burden and still Jiyva refuses to replace Str with Dex.
Thank you.

[Sandman25]

Source diving proved there is no way I can influence it unless I will wear FDA/IDA instead of my Plate Armour and CPA. Jiyva respects desire to wear heavy armour (EV penalty >= 5) along with desire to cast spells, but she does not take into account desire to wear heavy armour and still have high Dex.

I think it is not right to dedicate all points to either Str or Dex:

  Code:

// Choose Str or Dex based on how heavy your armour is.
        target_stat[(evp >= 5) ? 0 : 2] += other_weights;

I want both