the bomb pattern in titan HM are way different compared to Titan EX.
yes, you learn the basics doing the easy mode, but you still have to learn how to play around Titan EX.
might as well farm training party for Titty EX, at this point. Even more if you got carried through titan HM.

I got carried throug titan HM too, the first time I did it...
now, after countless tries of titan ex, when I get to play titty HM for secondary class relic, it feels like a joke.