Hi Holley,
On my calculations 75% at $1.40 gives you 5% POT which is very acceptable for place betting.
Level stakes are by far the safest.

You could try a 50% of the initial stake increase after each losing bet.
Eg 10,15,20,25,30 and keep your bet at the higher level until a profit is shown.
If a win with the $30 bet doesn't give you an overall profit because you have already lost $70,then keep your next bet at $30. If it wins and you show an overall profit, go back to $10. If it loses go up to $35.
However in my view it would still be preferable to find a bet level which you are comfortable with and level stake.