Tbh, i don't think that we do take the foot off; we tried - at least in the Inter and PSV games - to score more goals and at the very least control the tempo to not give the opposition any chances. Unfortunately a worldy killed us vs Inter and sloppy play killed us vs PSV. In both lack of clinical finishing caught up with us and in both panic in our defending also cost us.
Overall, our defence is much less solid than it had been compared to previous years. Perhaps the lack of pace of Trippier and Davies means Lloris feels he has to rush out sweeping more than he used to when Walker and Rose were bombing up and down and leaving much less potential space to exploit in behind; Also the cbs are more nervous without the 'wall of meat' in front of them they used to have and are more jittery and them being more nervous of Lloris and so, the circle of defensive fragility has been created...
Oh well, if you don't try and plug obvious weaknesses that were clear before the summer, this is what is prone to happen..