I definitely understand where you're coming from. In this regard, we've actually tried making the shakes flavourless. However, we found that it took away the joy. We try to offer a range of products to suit everyone's needs. There will be other flavours of Jake soon, but the next flavour we'll introduce will be a fruity (sweet) flavour. A savoury flavour is certainly interesting. Sorry to disappoint though, we're not currently developing a savoury flavour.
Taste is always difficult because it's experienced differently by everyone. In this regard, we've first chosen for vanilla, because it's relatively neutral and thus leaves room to make alterations to the taste yourself. Some tips to that might interest you.
You can alter the taste a bit by adding some water (I'd recommend 450ml cold water) to reduce the sweetness and thickness of the shake. My personal favourite is to add some (cold!) espresso. You could also add spices like some cinnamon, cocoa, milk, or fruit juice. Some customers blend in (frozen) fruits like strawberries, banana or nuts to change the taste. Please note that this all makes the experience less convenient and adds calories/nutrients. Hope this helps!