Thin it out. Take the 1.5 and use less, add them to the whirlpool, and add your whirlpool hops to the secondary to dry hop. Also to balance that much malt, you need a much greater initial hop. Since its a barleywine and not an IPA, you can't get away with a weak initial hop addition. Lastly, you're going to need more yeast. One package for a 1.100 beer will not come close to fully attenuating unless you 've got some really great technique regarding your starter.