To be honest, I am not a big believer that heavy handles make razors more aggressive. I think a heavy handle can and will add stability (that is why I use a stainless steel handle with the R41) and also they change the balance point, which may make a huge difference and perform more to my liking. ...
For me this is the essence of a good handle (and of course I don't use a Tech for its aggressiveness!). The balance and the crisp definition of the balance point are the main points for me when I choose a handle. This is something Cooncatbob taught me back in the days.
Of course I might be a bit extreme in this (says the guy who's on shave 40 with his Polsilver SI) , but the grip at the balance point is what makes the razor float IMHO!