"...does 42 oz..." Not really. It's unlikely that you'll ever be holding the pistol up for very long anyway.
The weight is better for shot recovery. The felt recoil of a .45 is nothing. Even with hot jacketed loads. A heavier pistol aids in absorbing what recoil there is and allows you to get back on target faster.
"...the slim grip..." Geez. I remember reading articles in the gun rags, long ago, about how big and mean a .45 was. Stupid nonsense. I very much prefer my Colt to my Inglis BHP. Both using cast bullets. The .45 has less muzzle blast out of a slightly longer barrel.