Try the DIY e-liquide forum where the pros hang out.
Also you can get ahold of TV and let them know your concern, that you love the flavor but would like a less sweet version and see if they have useful advice.
Off the top of my head- the solution to polution is dilution. The problem you run into is that anything you dilute your
juice with will diminish the strength of the flavor, You can use pg or vg of the same nic concentrate and retain that, but your flavor strength will decrease proportionally to whatever you add that isn't flavor concentrate.
Think of how you must fix a cup of coffee that is too sweet: you need to add more unsweetened flavor (more coffee which breaks down to everything in the original recipe minus the sugar). So you would need to be able to get your hands on the same flavor base unsweetened, and mix the proper ratios of pg/vg/distilled water to match the recipe, then use it to dilute your current stuff, the same way you would use 0mg nic
juice to cut higher concentrate nic juice.
If your juice recipe has a sweetner added by the "chef" that is not found in the flavoring then this is easily done. But if the sweetness comes from flavor concentrate (which in your favor is not likely) then you are kind of stuck.