If my decision is overturned with MR, when will my payments get backdated to?

Well that's a relief I have claimed before in 2017 unsuccessfully I didn't appeal it back then because I didnt think there was any point but reading things are here is what made me ask for a MR this time around 

I applied in April so will be happy if it's backdated from then. I was going through a bad period of depersonilstion at the time I filled out my forms so it was no where near as detailed and ordered as it should have been so im not realy surprised at the decision I only hope that it doesn't end up going against me as when I'm in that frame of mind I sometimes don't think straight but my mandatory reconsideration might seem as though a different person has wrote it as I put alot more effort into it and more detail of how things effect me every day not particularly real life examples but my sister and a close friend of the family have both wrote me supporting letters describing how I am from there own personal experiences so I'm hopeing they actually take that into account also ? I was told max of 11 weeks but could be before so im hopeing it won't be to long. If the decision remains the same my next step will be tribunal and I can give my examples of what happens when I attempt certain activities. I was also wondering should I have said what points I expected to get I have read some people have done that but I didn't want to seem that I expect the enhanced rate ?