Mate, whether or not you realise it, your finds with the 6000 show that you too are now an experienced (and successful) prospector! Don't let the 'mine's bigger than yours' brigade fool you into thinking you're using an inferior machine - you're not and your successes prove it.
Walking over big gold is the only problem and it's one that every prospector faces, as it's few and far between nowadays. If you're finding small gold, one day you too can walk over the bigger stuff. Dogged persistence with a machine that's proven to work well for you, is a better recipe for more future success, than a never-ending search for greater horsepower, IMHO.
Check out this link and his follow-up a few posts later in the same thread. Two beautiful chunks
on the same day, 10 times more gold than his previous best day:
Paid As You Learn! That's not a bad deal, I reckon. 💰
www.prospectingaustralia.com