Bigger dont mean bigger clutches all the time. My 1400g normal girl gave me 8 eggs last year where my 2500g mojo female who is 2.5 years old dropped 7 eggs. Age and size plays very little role in the amount of eggs one will produce.
Genetics is where its at if you want large clutches, you hold back the females from a large clutch or buy from a large clutch. As some females will never surpass 1500g. And there's nothing wrong with it at all. There's not that many females out there as it is dropping 10-15 eggs as it is with the average clutch being 6-8 eggs.
I also have a virgin girl that laid last year at 1600g, shes gained that weight back and added 200g, and has recently just ovulated. They continue to grow well for me even when bred young. Ive got girls that laid small who are in the 2000g range now. Never once did it occur to me that breeding a small female will doom them to be small for life, as i wont believe that for one second.