Yes ... it sounds to me like you have the sensitivity too high. I've often wondered how a person used to a silent search detector would find a threshold detector to use (especially one like the Explorer which has full tone ID as well).
You should try to turn the sensitivity down and play around with it in manual and semi-auto sensitivity until you get a more stable signal..
While you should try to get used to a hunting with a threshold, initially, it might not be a bad idea to set the threshold at 5 or less which would effectively make it a silent search detector as well (at least until you get more used to things).
Use factory defaults ... that is, don't use "extreme" settings, such as, high gain, etc until you get some experience with the detector.
While it may never have the quick simple beep of a Tesoro you'll start to enjoy it when you start getting some good deep targets and the increase in confidence will help you stick with it until the advantages of silent search and multi-freq tone ID become more obvious to you.
It may take some effort but I think you'll find it worthwhile ... good luck ... Gord.