The modules will not change draw weight or length, just letoff. Believe it or not, I find the 75% letoff harder to shoot. There is so little holding weight that my bow arm tends to move around more than with the 65% module. Try one out, it may work well for you.
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NRA - IPA IRA ISA IHA Certified instructor
NAA - Level II Coach
PGC - IBEP Bowhunter Safety Instructor