my suggfestions (see inside).

Make a list of your achievements from most important ones to less important. Then in your each recomm letter, just mention two or three major achievenets and 2-3 minor achievments based on the reference's background. Do not mention everything in your each letter. Do not just list them, you need to present them from the angle as influence of your work.

Just my personal opinion.

Good luck

[e-mail]