Is that Mercury 2 Hard or Medium?I measured from the topsheet for the 50d reading. I imagine if I remove it from my blade and measure from the sponge it'll be harder. Loki Rxton 1 Plus was slightly harder when measured from the sponge.
I don't the booster (baby oil in this case) will change the hardness by 5 degrees. For comparison, I heavily boosted a Mercury 2 with baby oil. A non-boosted sheet of M2 is 53d (topsheet) and 50d (sponge). My heavily boosted M2 with about 40 hours of playtime came in at 51d (topsheet) and 47.5d (sponge).