Help in calculation

I think i’m on a right way but missing somewhere +/- 1.
How i encrypt (for example letter ‘a’):

a is 97 in ascii and 65 in renumerated string (97 - 32). 32 - first character in visible set
95 - 65 = 30 (95 total of visible characters according to wiki)
character in re-numerated string at this position is ‘>’ (30)
character value = 62
[/Spoiler]

How i decrypt (using value 62):
[Spoiler]
62 - 32 = 30 (get this character value in renumarated string)
95 - 30 = 65 (get the value which were substructed)
65 + 32 = 97 [a] (get original ascii value)

however i’m getting “Incorrect answer”