I think ED's rollers (Comparing across the board to others rollers) are pretty "fair". I've heard some say even on the low side....but certainly fair; ie: In the middle of the results range per-se for mods done.
From what i've read RST rollers are quite "harsh"......again compared to other Renault / Clio specialists you see regularly mentioned.
From that - i'd expect my (And Bens for example) figures to drop slightly if tested at RST and i'd expect yours to rise Johnny99 if tested at ED.
Thing is - they are different people, different rollers and both are "in the ballpark". And if modding further and re-testing at the same rollers; it matters none.