95% sure it'll be an incidence issue.
If it has the scale incidence built it 'll certainly climb dramatically due to the low weight/high power our models have compared to the full size.
Because its a carrier aircraft... max lift was needed in the shortest distance.
Having said that, it's a H9 sports scale so I'd have guessed they'd sorted that out and normalized it for RC use.
You can counter this with down thrust (not all but it'll help) or/and mix down evelator to throttle.
Don't know exactly which H9 H'cat you have but if you look at this clip, this model certainly seems to be flying tail low.
http://www.youtube.com/watch?v=3ozU6Pnq1Jg