Beer styles recreation. Do you have any suggestions on style parameters?

You are most certainly experimenting. I can drink a Helles if made right. I like the maltiness in a Vienna which should be able to handle the increased bitterness and alcohol. Do not mash too long or your beer will be thin. Are you using fermentable adjuncts to increase your ABV? Look for a strong fermenting yeast. I suggest using your reg choice for brewers yeast for beer flavor and a wine yeast for greater attenuation. This mead yeast may work for you Activator 3632.