There isn't really anything anyone can do to help. The way the current launcher and backend is built, if you have file access to the main server, you can edit any of the files, including the main modpacks. This entire system is far from ideal, but it's what we have now, and until the "new" launcher comes out, I just have to work with it.
At home I get an up speed of maybe 600 kb/s. This last week the packs totaled about 2 gigs. That takes a long time. Additionally, my schedule doesn't allow me to pick an exact time each week I can guarantee having time to do the uploads. However, I am always happy to upload a hotfix if needed, you don't have to wait the whole week.
Also, the 3rd party packs system literally wouldn't exist if I didn't do it. I'm not trying to diss slowpoke or any of the other staff, but I can almost guarantee it wouldn't have gotten past the early concept of a year ago. It's just too much work for so little gain.
I'm happy to work with people if they need something special for their server, and hopefully the system will get better over time, but at this point it's mostly take it or leave it.
The other two good options I know of are the Technic launcher, which is robust, but I'm not a big fan of the launcher itself, or McUpdater, which I haven't checked on in several months, so I don't know how well built it is currently.