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Reason I ask is that ABS (the big 4" drain) usually do not clog up because its plastic and nothing grows on it. Cast iron has all kinds of rust and calcification to catch all type of toilet paper and hair causing clogs. Drain pipe under sink is not a big deal but we usually install all that with ABS to make sure there will never have any chance of leakage. PITA, but worth the effort. How old is the house? ABS is only popular in the past 30-40 years around here.
When you fill the sink or does the shower drain slowly after water is allowed to sit for some time? If that happens, you have a blockage that narrowed up in the pipe only allowing a small amount of water to drain through. If Instant Power doesn't open it, its time to stop messing around and call the big guns in to get that out.
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