by putting that bigger sump on you arent fixing the problem, which is what you stated in your first post, youre just bandaiding it, which is the same as 1l overfill on track days..
we were trying to help you out with the other little points in your original post you made...
few other sumps,
http://www.performancemetalcraft.com.au/
http://www.lewisengines.com.au/category55_1.htm