Not to be rude, but there is more to healing with AST then just healing. If you really just want to heal use WHM and you will have less complains. Key word LESS. Healing jobs also have support rotations which are essential to party to help. AST is more of a Support / Healer. It's like asking a PLD not to use shield oath, or a DRK not to use grit. It's a must. For AST cards are a must. So take it as an advice and practice them, learn how they work and believe me you will wish timer on them would cool down faster.