Rectifiers parameters
You are talking about two different powers and you are neglecting the losses.

The Power Out (or load), for a rectifier, is DC, and would be given by the DC equation \$P_{dc} = V_{dc} * I_{dc}\$
The Power In for a rectifier, is AC, and would be given by the AC equation \$P = V_{rms} * I_{rms} * pf\$

The difference between the two numbers are your losses:
\$P_{out} = P_{in} - P_{losses}\$ or \$P_{losses} = P_{in} - P_{out}\$

Your efficiency, in any system, DC, AC or rectifier is always the ratio of your output to input. 
\$\eta = P_{out} / P_{in}\$

Your load power for the rectifier should be using the DC values, not AC RMS, that should be your input power.