i really like the za-13 because its really small and light
I don't think the G403 is smaller than the EC1-A. Check out rocketjumpninja(google). I like his mouse rankings and hand size stuff.
G403 is not smaller than EC1-A.
Buy EC2-A / EC2-B; ZA13 / ZA12 / FK2.
EC2-A / EC2-B = small - medium hands; claw grip / fingertip / palm
ZA13 = small hands, palm grip / fingertip
ZA12 = medium hands, palm grip
FK2 = small / medium hands; claw grip.
I use Razer Gigantus mouse pad, for me is better than G-SR-SE Blue / HyperX Fury / QcK Heavy (what i used before)
Get a ec2-b or fk2
Or even a za13