it would seem to me (although i'm only recently returning to fish-keeping) that your ammonia levels are high in your 'cycled' tank because you don't have an adequate bacteria colony established to support your
bio-load. bio spira will boost your bacteria colony, thus helping to get the ammonia converted at a rate that will be sufficient for your tank. in the meantime, the water changes are important to give the inhabitants some reprieve from the stress of the ammonia/
nitrite as your tank gets more stable...
i'm sorry to hear that it's not available near you. i can't find it here either. so i guess your options are... wait, with increased water changes alone your tank will eventually stabilize... and/or try to find someone with an established/healthy tank and see if you can get some old filter media from them, or even a scoop of gravel?
good luck.