Is there a way to find a good base when a coin is shooting upward?

There is definitely a base at 640, and there seems to be a decent base at about 950..

Is there a base at 1100?

Is there a way to find bases WHILE it's going up like this, so that I can buy during the FIRST big drop?

Or do I have to wait for a SECOND drop so that I can use the first drop as a base?