Edit: No, sorry, you're right; I should have included the base damage.
normal chance + crit chance * (1 + crit damage multiplier) = expected value
0.95 + 0.05 * 1.45 = 1.0225
0.94 + 0.06 * 1.46 = 1.0276, an increase of 0.499%
0.93 + 0.07 * 1.47 = 1.0329, an increase of 0.516%
0.92 + 0.08 * 1.48 = 1.0384, an increase of 0.532%
.
.
.
0.75 + 0.25 * 1.65 = 1.1625
0.74 + 0.26 * 1.66 = 1.1716, an increase of 0.783%
And suddenly crit sounds even tastier.