hello there,
those settings sound fine but i would suggest you try putting your upload to 10 that way your download will be able to dl at its maximum speed. settings something like (limits: down-30 up-10 slot-2) (capacities: down-30 up-15), make sure you open ports 4662, 4665 and 4672 or forward them to you computer in the firewall if you have one. (thats if you have not changed the default settings)
as your connection is relativly slow you may find browsing v-slow whilst amule is running if this is the case i would suggest you set your setting to (limits: down-20 up-10 slot-2) (capacities: down-30 up-15)
if you changed your upload less than 10 then you will notice that your download speed will automatically change too,
if your browsing is still too slow just try reducing the upload speed in the limits untill you find something thats comfortable for you. but do remember running prgrams like this do use alot of your bandwidth whilst downloading and sharing files.
hope this helps a little?