I would think it'd be fine. You'll just fill up a smaller amount of the flask and you'll be ready to go when you tackle a higher gravity beer. You also want to have a good bit of headspace so you're yeast doesn't take off too much and make a mess outside of the flask.
Kegs: Tri-Peppered Saison and Sunset Orange Kolsch
Future:Something new, SMaSH perhaps?
2013 Previous: Sunrise Honey Rye Pale Ale, Dark Skies Black IPA, Sunset Orange Kolsch, All Hallow's Eve Pumpkin Ale, Raining Hops and Dogs IPA
Dark Skies Black IPA - 2nd Place at a local comp. Score of 39 from a BJCP judge
GT Keezer Build