in the midst of fishless cycle...problems i think

It sounds like you may have been putting too much ammonia in -- the idea is to put just enough in each day to bring levels back up to 5.0 ppm (rather than adding 5.0 ppm each day).

Another technique is to add 5.0 ppm of ammonia and then wait until the ammonia level hits zero -- then add 5.0 ppm ammonia again. This is the technique that I use because it involves less math, less squinting at test kits, and less smelling ammonia. It shouldn't add significantly to your cycle time (as long as you are still testing daily), but it will make your life easier.

(Quick side note -- I use Seachem's "Ammonia Alert" product for a fishless cycle. It gives you a constant reading of the ammonia levels in the tank, so you don't have to conduct tests every day. When the "Alert" dot turns yellow, add ammonia -- easy. I leave it in the tank when I add fish to make doubly sure that the bacteria colonies are sufficient, and then after a week remove it, saving it for the next time I need it. The Alert is good for about a year, and it cost about $5. Well worth the convenience for me. And no, I don't work for Seachem.)

I would do a large water change and then bring ammonia levels back up to 5.0 ppm. Since the nitrification bacteria don't really live in the water table, you won't be setting back the cycle by performing a water change.

I always do a water change once I start seeing nitrates and high nitrites, because I don't want to bother waiting for the nitrification bacteria to gobble up all that extra nitrite in the water. The goal of the fishless cycle is to have your baseline level of ammonia entirely converted to nitrate w/in 24 hours. So if you get very high nitrite levels, don't kill yourself waiting for all the accumulated nitrite to go away -- do a large water change to reset things, add ammonia, wait a day and see where your bacterial colony stands.

Your cycle sounds like it's coming along well -- your nitrates show that the end is in sight. So don't worry and keep up the good work!

HTH.