The first thousand bomber raid on Cologne was 31 May 1942 the next was 1/2 June 1942 on Essen, be sure Cologne and Essen were hit.All they achieved bombing at night was dump bombs randomly across Europe, yes they would suffer losses bombing in daylight but at least they would bomb the right country and maybe get a few within a few miles or heaven forbid actually hit the intended target.
Imagine how many they would have lost over Germany?The reason for the shortage of Spitfires was because they were squandered over France on pointless rhubarbs, they lost around 300 in the first half of '42 alone.
The higher cruise speed is a zig zag speed, the ground speed and therefore range is governed by the speed of the bombers you are with.The extra fuel available would allow for a higher cruise speed which is what they needed to do, lets be realistic, the RAF were going to lean on the enemy one way or the other, that's the deal so they may as well achieve something worthwhile doing it.