I've heard the same 1-2 lbs ROT numerous times in researching for a Cranberry Lambic. I am going to start on the low side, but I have a much longer time and easier product to tweak with.
Keep in mind you can always add more, but can't take it away easily. I can blend too, so wasn't too concerned with it being too fruity. I would suggest using the fruit base (or just frozen berries) and tweaking with the extract.
Secondary: Oktoberfest, German Pilsner, Double IPA,
In Bottles: Lucknow IPA clone, Rough Rider Brown Ale clone,
John Harvard Imperial Stout clone, Hoppy Amber, Witch's Brew (Habanero and Smoked Corn Small Ale), Porter, Dunkleweizen, Dry Stout, Irish Red Ale, American Maple Wheat Ale, Black Wit, Belgian style Wit, Belgian Golden Strong Ale
Kegged: IPA, Saison, Hoppy Brown Ale