That is very good! Actually, the ammonia that is purchased in the local supermarket varies so greatly in the actual concentration that it is sometimes difficult to know how much to add. It is best not to get the ammonia in concentrations much over 4-5 ppm, though for that can slow the bacteria a bit. Under that is still fine. You just want to "feed" as large a party of beneficial bacteria as you can to encourage them to multiply. If there is sufficient "food" they will multiply.
You do not have to raise the temp of the tank, but 78-80 degrees is the optimum temp for the beneficial bacteria to reproduce. They will still be fine, if slightly slower to respond at lower temps - until you reach a low enough temp that they virtually go into hybernation. You are no where near that low.
Doing a fishless cycle using BioSpira is an easy and quick thing to do. Start the tank running, filters and heater and all. Add the ammonia and the BioSpira and away you go. Remember that the BioSpira will not attach and take up residence in your biomedia for at least a few weeks, so if you change any water out, you will be pouring BioSpira down the drain. Since you do not have any fish in the tank, you do not need to change any water. Just make sure you "feed" a small amount of ammonia to the tank every day - for that BioSpira will start processing the ammonia you have started the tank and need more soon. A good way to determine how much is to start with the 4ppm and see how many days it takes for the bacteria to make it go to zero ammonia. I would guess that it would take about 2 -3 days. Then you add about 1/4 that amount of ammonia each day to the tank. I "feed" my sterile tank every day when I feed my fish. It works well.
When you are finally ready to populate the tank with fish, you will need to do a MAJOR water change - at least 75% - perhaps several 50-75% water changes to bring the nitrates to within reasonable parameters. Try to leave the biomedia as untouched as possible.
BioSpira says it will cycle a tank instantly, and, with certain reservations, it will. But the bacteria does not colonate the media instantly. It stays in the water for many days. This type of cycling would work well, if you did not change the water at all, but with fish in the tank, you would have to. Doing a fishless cycle with BioSpira is really the best of both worlds. You can cycle quickly, parasite free, but still do it well. Just remember to give the bacteria time to attach to your biomedia really well before you change your water. And realize that after your cycle is complete, the tank will have extraordinary amounts of nitrate in it just as it would had you done the cycle in the "old fashioned" fishless cycle way.