Lol... It shouldnt be a major issue
1- 7 arrows of each kind... Or at least 5 we hope
2- refletch skill bringing total to 10 or 8 at worst case scenario
3- during cd of solid/steady shot with double still on cd fletch as u go - I always have craft incend and tesla on hot keys, it fits nicely when you are waiting that 1 second.
Anyways try keeping up your suply of your first stack of seven by incorporating a fletch or 2 in your rotation where you have to wait a sec for cd to finish and should be no prob-unless.... You don't have fletching rubies ? Or... You only have 3 base arrows ?