bigger = more power, but also more power to move it. prob is... your surfaces are designed for the job, so, if you make them like a fun fly, the wing section wont be able to cope at the lower speeds your surfaces will, ie, you stall crash and die.
give more of an idea on what plane, and what/why you want to do it.
maybe a quick fix, if you want more agility, move the CofG back a tiny bit, this will make the plane more twitchy and give the same feel of bigger surfaces.
there are rules, such as % of wing area. fun flys can be 25% for ailerons, some have 90% elevators!