When to repot this Phrag?

[jeremyinsf]

Hello,

Any suggestions on when and how to repot this Phrag Caudatum? It is in a 4" pot, and very root bound, and I understand Phrag's grow a lot of roots very fast. When I bought the plant, I was told 'you will need to repot it before too long'.

There are two mature spikes on the plant and as I went to take this picture, I saw a 3rd has just started to emerge. There are 9 fans total, two of which are smaller, new growths from the last couple months. I don't want to disturb it if it doesn't need it, but also realize it may take quite a while until it is out of spike. I don't have enough experience with Phrag's to know when is best and what impact the repot will do to the current spikes and flowers. Would putting it into a 6" pot give it too much room?

Any other thoughts / suggestions?

Thanks all.