Candi and carapils are canceling each other out in this, contributing opposite effects. Also, If you're looking to get anything like the commercial Belgian's try using a Pilsner LME, that way you'll get a more authentic malt flavor you're probably looking for.
Golden Strongs are effectively just Pilsner malt and Sugar (plain sucrose is the sugar the Belgians use, American homebrewers are the only ones who use clear candi syrup

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Try getting your OG with just Pils, sucrose, and maybe just a touch (up to 0.5 lbs) of Aromatic malt if you want to put a little more malty flavor in there without affecting the color too much.) That's the classic recipe for a triple at least. If you're going for something more like Duvel, stick with just Pils and Sugar only (lighter malt character there.)
Assuming you're doing a 5-5.5 gallon batch, you're also looking at an ending abv of 10% starting an an OG of about 1.087. With that OG you're also looking at roughly 3 vials or 2 vials and 1.3L starter or 1 vial and a 3L+ starter according to Mr Malty pitching calculator.
Big brews like that are tough to get right, pitching enough yeast, keeping the initial temp low and then ramping up after the initial growth phase to avoid hot solvent flavors from fusel alcohols. That being said, good luck mate, I do hope it turns out great for ya! We're here tohelp if you have any questions on it