PPLMuppet, you can be my wingman anytime
Good call i say even though incredably frustrating, it's sometimes tempting to ignore little safety matters in order to fulfil ones flying needs. The other week i had booked a few hours our clubs Pa28-180 only to find the oleo pressure had been leaking in the front strut and had dropped considerably. Research revealed that you can fly it safetly so long as 2'' of strut are showing which there were but I figured that it would only take one of my dodgy landings or a gust of british breeze to potentially do the aircraft more harm than good. I decided, all be it reluctantly to cancel the flying until it was fixed. I was horrified to see later on that people after me had booked the aircraft and had gone flying despite the problem not being resolved!
Thankyou for you're post, you've proven there are still pilots out there who take this lark seriously! hehe
Incidently, your club should have access to all the hard original copies of the Robins W&B, T/O and Landing performance data. Best to go by the original docs as every aircarft is different, even if it's the same type.