The weight issue was one of my biggest problems when learning.
I found many RAA schools have blinkers on when it comes to weight.
One school took me for a TIF and after I did a bit of homework I calculated after guessing the pilots weight that we took of about 80-100kgs over mtow.
Obviously they failed my safety standards test.
When I started to learn I was 130 kgs. It is possible with the correct aircraft, instructor and fuel load.
I found that once I started there was plenty of incentive to lose weight and keep going.
You do need to work out a series of questions to ask any potential flying school and you can only do that by visiting lots of them.
A Foxbat with and empty weight of 300kgs, a 130 kg student an 80 kg instructor actually still allows for full fuel tanks.