how about adding fixed and/or dynamic % rate to:
- Never Buy Over Your Last Sell Price
- Never Sell Under Your Last Buy Price
for example:
Never Buy Over Your Last Sell Price "+2%"
"+2%" - next adjustable field?'
or:
Never Buy Over Your Last Sell Price + 1/3 1/2 1/4 1/10 of % of market deviation based on last market explorer query?
and perform this query once in an hour?