if the car only weighs 1.3kg then definitely add weight.
The BRCA weight limit is 1.474kg for 2wd, so if you race anywhere that actually scrutineers the cars then you will have to add weight whether you like it or not.
It will handle better and be easier to drive with more weight.
The wing is nothing to do with the wheelies, and will make little difference.
(Wheelying generally occurs when you accelerate initially i.e when you're going relatively slowly)
Are you sure your figures are correct? I'd be surprised if you have actualy got 66% 33% weight split with a rear motor car weighing only 1.3kg. I'd expect a little more on the rear.
Add some lead sheet under the battery if you can. - It will make the car easier to drive.
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Stability is everything in offroad - especially if your driving's slightly iffy.
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