Yeah, you have to open each individual kit to full size before downloading - it's a blogger.com issue which is unfortunate... I only put them on a blog as it's easier to manage and quicker to upload!
All kits on the blog are 2048 pixels except for the MLS kits which come in 2048 & 1024 pixels - something I will do once every league is complete in order to save space and make it easier for everyone to pick and choose!
I do everything you say and likewise the kits I download in 1600 x 1600 resolution.