I think that any design with severe angles is tough. I often try 2 or 3 different ways with different "patterns" and see what I think works out best and what I think will hold up the best.. my recommendation would be to make a heart with the turning method.. used dryer sheets work really well for the back side.. just be sure to "use them up" as any retained fabric softener can leave a greasy spot on the hearts. Also the fabric softener sheets are lighter weight so work nicely.
Looking forward to knowing what you decided to try.