If it looks exactly like your picture....basically you can count the spots pretty easily...then it does sound like Ich is present. Velvet looks similar, but usually more of a dusting and harder to "count" the dots.
It is also normal for Ich to look "less" after a couple of days as the parasite falls off into the water column...definitely need treatment soon. Ich and Velvet are treated the same way....velvet is just more of an emergency since it kills in a couple of days typically.
I am not familiar with Ich-X, but it is a formaldehyde (3%) medication which works on external parasites. Typically we perform formaldehyde dips for brooklynella, etc... but it is at a 37% strength. But others have had success with IchX. Just follow the directions exactly as prescribed...and don't do it in your main display tank, only a quarantine/hospital tank.
Raising the tank water can cause the life cycle to speed up a bit. We go fallow for 72-76 days because the longest lifecycle for a strain of ich in documentation was 72 days, supposedly...so they give it a couple more days to be safe. But, I believe that research was done with water temperatures in the upper 60's...in theory, that may not have taken 72 days in warmer water. But, we don't have any other research at the higher temps (that I know of)...so, we have to adhere to the information we have.
Good luck...