Hey @chris_b
Thanks for the advice however the reason I haven't persevered with 5ers in the past was the issue about muddy, ringing strings because I wasn't muting them properly.
This morning I was working on playing slower, muting strings and using the floating thumb technique. It did feel like I was a novice again but it gives me the chance to clean up existing bad habits that many of us may have.
Being self taught I probably developed issues that I can, with advice and input from more experienced players here, avoid or retrain when learning the 5 string.
This is partly why I'm highlighting the new bass and hope that by learning from other players, others, in the future, may learn from my journey.
I've started another thread - "Do you need a 5 string bass" -
where I am posting things I'm finding useful and hope that others will post with similarly useful resources for those, like myself, moving on to 5ers.