ChromeFever re the best 7 weight for what you want to do.
I haven't casted big tube flies, but my Sage 7141 with the Mid Spey 7/8 with the interchangeable tips does what you are talking about.
In Northern California, we don't have that big of steelhead, and the 7141 can handle them.
The local Sage Rep favored the 7141 as the all around winter and early spring rod for Northern California. He uses his 7141 to fish for the big steelhead on the Smith River.
In heavy winter flows, the 7141 will lift up big flies, the sink tip compensator, the new fast sinking tips with no problem with either a single or double spey cast. If I pay attention and time the casts correctly, there is no need to roll cast to get the tips up.
Another alternative might be Bob Meiser's 7/8 switch rod with the WC 678 with tips. Yesterday, I took my 7/8 to the Napa River at high tide to just play. I couldn't wade at first, brush was right up to my back, the wind was swirling and gusting up to 25 knots, and the river was going down and upstream at the same time. I was able to roll cast size 4 and 2 Striper flies 50 and 60 feet with the tip compensator and the type eight sinking line from my Mid Spey 7/8 set. I had so much fun, I'm headed there again in a few minutes.