Recipe(tried): Pina Colada Cheesecake - how to add more flavor?

I have a recipe for a Pina Colada Cheesecake...

2 (8 oz.) packages softened cream cheese
1/2 cup sugar
1/2 tsp. Vanilla
2 eggs
1/3 cup frozen pina colada concentrate (thawed)
1 graham cracker ready crust

BUT, my problem is this:  I made this cheesecake for my husband, and it was delicious.  The only problem is that you can't taste the pina colada flavor!!!  (It tasted like a plain cheesecake.)  I am NOT very gifted in the kitchen, so I wondered if it would mess up the recipe if I add a little more of the concentrate...say maybe 1/2 cup instead of 1/3.  I am worried that the cake will not set up right if I change anything.  Does anyone have any ideas or thoughts on this?

Reviews and Replies:
1	Recipe(tried): Pina Colada Cheesecake - how to add more flavor?
	Jillian, NC

2	Recipe(tried): Pina Colada Cheesecake - Pineapple/Coconut Topping
	Patsy,La

3	Just a guess regarding Pina Colada Cheesecake
	Kelly~WA

4	Recipe: Pina Colada Cheesecake with Bread Crumb Crust and Coconut-Almond Topping
	Sandi/SC repost of Marilyn/TX

5	Thank You: Pina Colada Cheesecake - Great ideas!
	Jillian, NC

6	re: Pina Colada Cheesecake - how to add more flavor - coconut flavoring
	Megera