Anderson told that LC of huggers/bursters was quicker because queen was hormon pumped and therefore her offspring was somewhat different then normal aliens should be.
Simply: this was his explanation of fu<ked up lifec cycle, and thats why I assume that Predalien from AvP-R can be also different cause queen from AvP was much bigger that the one from A2. This is only logical explanation of regurgitation and queen molting process which is not changeing canon.