Giant day gecko Male introduction

[Penemue511]

Hello, I was wondering about what size to introduce my Male giant day gecko to adult females. I've bred many species of geckos and never had issues, but while I've kept day geckos I've never bred them. Had these two females for a little over a year that I acquired as juveniles. Picked up a sub adult Male and he's beefing up, but his enclosure is getting tight and finances are pinched. I've heard larger females can be aggressive to new males (they get along great together, but one claims best spot). Home is plenty big for 3, so looking more for temperament issues with size difference. Male is last pic, over 6 inches.