Afghans in Progress

The purple afghan is working up very fast, still surprised at how soft this mill-end yarn is! I'm about half-finished.
My friend selected a hunter green and off-white for the afghan, and I puchased about 15 skeins of yarn. I started with a Tunisian design with hearts, but wasn't happy with the way it was working. Could it be the size I hook with a worsted weight yarn? I could have been crocheting a chalkboard, it was that stiff. I then tried a post stitch pattern, then another Tunisian with "long stitch". I think that's the stitch I "created" for my baby layette, need to check back on that pattern. Anyway, the 2 colors created a tweedy effect, but wasn't totally happy with that. I went back to the hearts but upped the Tunisian hook to an L. Love those Easy Tunisian Hooks! The hearts are not very heart-shaped. Is there a way to crochet a really nice heart?