As I understand it, Perry reflex is not induced with heat but rather "glued in". When you glue laminates, rather than glue them flat, you can use blocks(or a form) to keep them reflexed. They will keep SOME of this reflex when the glue is dry and they are released from the clamps. By doing this you move some of the compression stress from the belly towards the middle of the bow.
The more laminates you use the more reflex you will keep but I think three is plenty. More will give you too much glue with some wood in between. :p JMO