simfly, I'm not sure the controlers do try to group arrival aircraft by wake category, from observation we are sequenced off the hold in turn from the various hold, irrespective of wake category, and then speed control/headings are given to achieve the required spacing on finals - any comment from the ATcers?
Anyhow you always end up with "160 to 4" at some point, and boe777, we definitely do not land at anything like maximum thrust.