Am i crazy or do lower backswings bowlers have a higher rev rate compared to those with higher backswings? All my teammates have lower to mid backswings but they seem to have a much higher rev rate than me who has a higher backswing

Plug some numbers into the calculator and you will see as you change the length of the pendulum the speed at the bottom increases as the length increases.

The period for a simple pendulum does not depend on the mass or the initial anglular displacement, but depends only on the length L of the string and the value of the gravitational field strength g. The simple pendulum equation is:
  T = 2π * √L/g
Where:
T: Period of the simple pendulum
L: Length of the pendulum
g: g: Acceleration due to gravity, the standard gravity of Earth is 9.80665m/s2

The velocity at the bottom of the swing is:
  v = √2g * L * (1-cos(a))
Where:
v: The velocity at the bottom of the pendulum
a: The angle from the vertical