Optimal way of playing two hands

Say you are playing one hand in a heads up game and at
a particular time you decide to place another bet on a free spot.
Suppose that there are no other players at the table and
the game is the following:

6D,S17,DOA,DAS,SPA1,SPL3,NS,5/6,Hi-Lo,C22 w/floored indices.

Now, how would you do this?

A) Wait for a particular TC to place the additional bet? What would that TC be?
B) Always play two hands?
C) Never play two hands?

Obviously there is an optimal answer which gives you the best overall SCORE.

Sincerely,
Cac