This idea is based off of findings from the (RNA) series of puzzles. When Uracil was removed as an option for the random number generator and a NT sequence was generated using only the other 3 bases, the resulting shapes that occur tend to be very loop heavy and bond-sparse. By comparison, structures resulting from removal of Adenine and Cytosine tended to still be very bond-heavy.
For the purposes of this topic, bond-heavy RNAs are defined as those with 70% of all bases being bonded.
The first strategy is as thus: Penalize any RNA for each Uracil located inside of a loop.
The second strategy is as thus: Reward bond-heavy RNAs which utilize at least 66% Uracil bonds. The strategy should be inverse if the RNA has fewer bonds.
The third strategy is as thus: Reward bond-heavy RNAs with greater than 60% Uracil bases. The strategy should be inverse if the RNA has fewer bonds.
The fourth strategy is as thus: Reward any RNA for each Uracil in a stack greater than one NT from the end of the string.