I have alot of crowding and my plants have some pretty heavy colas. I'd say you be fine.

I'm also flowering under a 400 watt hps. Check out my grow log for some pics for the crowd and a pic of one of my colas. Originally that cola was my biggest one but due to some ph issues my smaller plants have colas that are fatter than that and fuller.

:thumbsup:

You'll be fine I would think