So when you say quadruple you're talking about how much extra malt and dex you're using? Might have to even use two packs of yeast if you're upping the sugars like that. Just so the gravity will keep dropping properly and then get to stable before you bottle....not to sure about belgian yeasts only used them a couple of times!
I love hoppy beers. I made an IPA a couple of months back. Used about 120g of hops in a regular 23L mix. Wow came out tasting like tropical punch beer(even non beer drinking women liked that one :thumbup
....probably cause of the 80grams of citra hops taht went into it. I love dark hoppy english style beers, but really any beer is good, cheap beer is especially good! With the coopers kits I can do a corona clone for like $12 per carton....and they sell it at the shops for $50.....I cant really afford to drink the beer I like thats why I make it myself and drink cheap crap from the shop!
Made a couple of chocolate stout/porters with the Cascade porter kit. They usually come out about 7% only using 3L of malt and a bit of grain. So if you're using over 3L of malt and then adding dex ontop I think you might get better results if you up the amount of yeast you use, either that or do you make yeast starters? Homebrew thread???