Not really an issue for me:-

Outmanouver - 14sec - 55sec recast
Aegis Boon II - 14sec - 60sec recast
Deflection - 14sec - 60sec recast
Guard - 30sec

Whole process takes longer than Outmanouver recast, so once Outmanouver is ready again, i just rinse and repeat, never without my shield in the raised position.