Though I am not as expert as many on the forum, that recipe is perfectly safe in a Marlin. Is a trap door level load for bullet weight.
Only concern is you crimped a bit hard and low in my opinion, normally want them in the crimp groove for good cycling and with plated the groove gives the crimp a bit more grip.
Don't worry so much about total length or published OAL, main thing is will it cycle and headspace properly. Being a bit short is better than being too long, if the bullet rests on the rifling the lever may not lock properly.
I have been loading 300gr LFNGC with 35-40gr I4198 with excellent (2") groupings at 100yds lately. Tried 400gr Berry's plated with 35gr I4198 and the groups opened up to 4" at 100yds, still trying to find the sweet spot for those.
Did you try cycling these through the Marlin? A good habit is to set the dies with 1 or 2 powder free cartridges and test cycling before loading too many.