Actually, that logic is just false...
You are of course totally free to choose the diet you use, but do not justify your choice by a bad logic.
if everything had doubled, well, basically, the recipe would be the same, you would just be doing a bigger batch... The only thing which has doubled is the amount of fruits and vegs, compared to everything else in the batch, it changes pretty much nothing (try it, when you make one batch, you do not have much more servings than before). It's no different from every other diets in which you switch the fruits n veg type everyday, different fruits and vegs have different amount of nutrients and different weights per volume (1 TBS of carrots weights 6 times more than 1 TBS of eggplants)
Same goes with the "between 6 or 8" .. it doesnt prove the diet is disbalanced, it just proves that things do not need to be in an exact fixed ratio all the time (
which would precisely be unhealthy, biologic entities are not machines), afterall, no one ever eats the exact same meal everyday unless they seriously want to have metabolic disorders and serious deficiencies.
Do not even get me started on imperial volumes, measuring in TBS, ounces and cups is unprecise by nature (by opposition to metrics 1 ml = 1cc, plain and simple).. How much is a TBS? Are we talking flat or lumpy? Depending on the size of the chunks of what's in it, doesnt it change the amount? If you want a precise amount of nutrients, you use weight, and it implies to know the charts of every single thing you use (which would mean analyse everything all the time since even 2 apples from the same tree does not contain the exact same amount and ratios of nutrients)... gladly nutrition is not that complicated.
As for the vitamins, the supposed average needs of your gliders haven't changed hence the quantity of vitamins hasnt changed. When you take supplemental vitamins, their amount is not in function of what you actually eat that day, but in function of your own weight, and they are, afterall, only a supplementation for what you don't get from your food.
If you switch diets because you think that changes immplies that the diet is disbalanced, as I said earlier every other diets have changed recipes, and to extends which are far greater than this change, just check their history, does that mean that every diet is unbalanced? (some have excessive amount of calcium, which imposes the use of a strict mix of fruits and vegs to compensate, that's not what I call balanced, some have excess amount of proteins, which is heavy on the kidney and liver -but lactating females need that protein boost- which is not what I would called balanced either...).
At the end of the day, there is no miracle and perfect diet, the only thing which should matter when choosing a diet is "are the gliders fed that diet healthy on the long run? . I think the experience speaks for itself, most of gliders are healthy on widely used diets, which includes that one, regardless on the amount of fuits and vegs used (which are always variable anyway, and your gliders know how to adjust, they just eat more if they need more, this diet has always been meant to have leftovers).
That being said, you are entitled to your choices, you can pick any diet you want as long as it satisfies both your gliders and yourself, but the best choice is always made using firm logic and not out of fear, rumours and assumptions.