I really doubt you serviced a DHX fully other than a sleeve service. What about inspection of all the internal seals etc. From ast experience I’ve had a DHX air serviced twice by mojo over the past couple of years and on both occasions the pro-pedle was blown, i hadn’t even notice. It needs to be done properly, at the end of the day a f**ked shock/fork could see you in A&E.
As far as the best service there’s nothing between Mojo or TFT, I’ve had shoks and forks serviced at both and the work has been spot on.
As for having pushed valving, I had a 5th element and a 32 van done on heckler a few years back, i’m no shock guru but it felt absolutely fantastic, the bike flew, very smooth. Is it worth the expense. That’s up to you. Try and ride before you decide.