The 27 DSRL is a 31ft TT, IMO having a loaded tongue weight in the 13% to 15% will provide optimum TV handling of the TT, especially in less then ideal towing conditions.
When the TT's loaded tongue weight is placed on the hitch ball that's where most of the tongue weight remains, it's the "effect" of the tongue weight being placed on the hitch ball that impacts the weights at the TV's front/rear axles. The weight on the rear axle won't necessarily be a 1 to 1 tongue weight ratio because TV hitch receivers and suspensions react differently (prior to WDH engagement).
At the end of the day until you have the WDH do it's magic with the TV/TT combo in question and re-visit the CAT, it's difficult to guess the rear axle weight and how it stacks up against it's GAWR.
2016 GM 2500HD 6.0L/4.10
2005 Jayco Eagle 278FBS
Reese HP Dual Cam
Putnam Class V