After driving this tune a couple races, my opinion is that this seems more like an MR drift tune. I've spent several months avoiding that type of driving in pursuit of setting competitive/top 50 ITW lap times. So because of that I am definitely more comfortable with conservative differential tuning, i.e. 5,8,10 I.T.,A.S.,D.C. respectively. This rings true the most when the vehicle being tuned is a lightweight and high-powered MR supercar that doesn't generate downforce as stock (according to GT6 anyway) and is also not compatible with the flat floor or front aero kit. I can see this tune working very well with racing tires as a long legged touring car or a 'production' car alternative to LeMans challenges, what with the car having 1.16kg/hp when fully modified but as this tune sits it does not work for me. Though I normally don't leave any feedback on tunes that seem off to me, I am going to with this one because i know that you're a very advanced racing enthusiast as I've used and succeeded with many tunes of yours before.
My guess is that there's a couple typos in the article, perhaps with the weight balast position? Wondering if 82kgs @-5% is really what you're saying we should do or if you meant -50%. Wish GT-Planet's template for tunes was more defined and clear. It's be nice if they added tips and info snippets with explanations on the effect of changes to this or that.
Thanks for reading!