I have done two things which appear to have improved the IR remote response.
1 By carefully bending the sensor component forward it is moved closer to the window and thereby opening the unobscured sensitivity angle.
2 Looking from the inside the window has a horizontal "ledge" that is a fraction of an inch wide. I took a small piece of aluminium tape and stuck it on this "ledge" in order to reflect any IR falling onto this part up towards the sensor.
The range and offset angle sensitivity is now good enough for my setup.
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