For Peak 6 when you get off the chair go right into the bowl. It is a wide open bowl at the top and it starts funneling into a narrower corridor as you go down. The runout back to the chair is fairly long and it can be tricky in one spot. There are some interesting short shots if you go right after the funnel point. I recommend following the crowd the first time down and look up to the right after the funnel area and you will see some of the paths that are rarely skied. If you make multiple runs here you can then try to get into some of those less skied paths. You can hike up to the top ridge of Peak 6, it is an easier (less steep) but longer hike than off the top of the Imperial chair.
When you skied off of E chair did you go into the Windows at all? To get to the Windows you go to the right when you get off E chair then look for the gate into the Windows on your left. Windows 1 and 2 (the number signs are just small pieces of wood with numbers painted on them) are very tight trees almost not really skiable. I like Windows 5 & 6 the best. Windows 5 is a narrow gully through the trees. If you go in the Windows the exit/run out can be a big challenge. Take the upper (Rick's) run out.
One of my favorite areas is upper Peak 7 (Y Chutes, CJ's, Magic Carpet,..). To get there you go up the Imperial chair get off to the right, ski across Whales Tail as far as you can go then take the high traverse to Peak 7. This is fairly steep terrain at somewhere around 45-48 degree pitch, but it does not bump up until you get closer to the bottom and the pitch reduces. If you ski out to skiers right you can go back to the base of the T bar, if you ski out to skiers left you can drop into Ore Bucket and ski to the base of Peak 7.
At Breck we get quite a few people that ski in the Level 8 & 9 groups. Breck sells an unlimited lesson pass that is directed to the locals with season passes. Many of these people ski in the Level 8 & 9 groups.
Enjoy your trip and ski safe!