You should just be able to bend the race blade stays, after all seat stays are not at a constant angle, geometry and size of bike has more of an influence than 27" vs 700c.
I have full gards on my 27" -> 700c bike. It's fine. They work much better than race blades + they take up the gap well as prav said. Yes you may have to tweak the front mudguard by extending the bit that bolts onto the fork crown.
You should just be able to bend the race blade stays, after all seat stays are not at a constant angle, geometry and size of bike has more of an influence than 27" vs 700c.
I have full gards on my 27" -> 700c bike. It's fine. They work much better than race blades + they take up the gap well as prav said. Yes you may have to tweak the front mudguard by extending the bit that bolts onto the fork crown.