I think what you have created is a wonderful tool. However, you are still using HitBTC price feed which can swing wildly for the simple fact that they stopped supporting STEEM and SBD a year ago. I don't think that it is safe to use your tool until you put serious exclusions into place. I recall at one time that STEEM on that exchange hit $150... Your tool can really mess things up. They are also doing some really crooked things. Even though HitBTC has stolen the user STEEM and SBD by keeping their customer's STEEM and SBD, they also moved 10017.019 STEEM to Blocktrades 6 months ago. That STEEM was customer's currency. https://steemit.com/@hitbtc-exchange/transfers