Hey Danny ....... my opinion for what it is worth & may well be wrong is that you are trying to jump the stream before you come to it.
What was it about the sage that you did not like that is making you think of changing brands?
I have been down this path several times myself & at the end of the day eventually found out the fault lay with myself rather than the rods.
I could go out & buy the best violin in the world but I doubt anyone would want to listen to me play it, let alone pay to do so. In my experience it is much the same situation with various reputable brands of rods
inasmuch as how do you determine if any percieved shortcomings are the result the equipment or the technique of the user .... maybe sound judgement in that regard might come with years of experience however even the regognised "gurus" are often divided in their opinion.
No disrespect intended Danny, but my understanding is that you are a relative newcomer to the world of flyfishing therefore perhaps trying to change brands at this stage in the hope finding a "silver bullet" may well turn into an exercise of futility until such time as you are in a position to know what it is you are after & why?
Asking the opinions of other members on here is also rather futile as we will all have biases & predujices which may or may not be valid personally but all the moreso if applied to yourself.
Seem to remember you purchased your Sage from Rod & Reel so the first step is to get it back into them asap ( or earlier ) for warranty repair & discuss any concerns you may have with Peter. In the meantme if you care to pm me it is possible we could arrange a casting session ( this weekend would be OK ) for you to try out a selection of rods including the sage vantage you have.
NB no way do I hold myself to be anything other than a very average caster, however I can usually recognise the faults others are making probably because I am also as guilty of doing so.
When you cry, feel pain or sadness, no one notices your sorrow .... BUT
fart just ONE time !!!!!!!!!!!