You need to check forestay tension, backstay tension and mast
You are running a fractional sail in a masthead furling
foil. In theory this should be ok however the difference with a masthead rig genny that is running furled is that the sail is in the foil all the way to the masthead and the sail is furled around the foil at the upper end.
Your set up should work but if with the halyard
"free" above the fractional sail you have potential problems with this setup in my opinion.
If the foil is bending it indicates the forestay is loose but also you have an unusual loading situation. One idea might be to add small rings to the halyard
and thread them above the fractional rig and around the forestay/foil as a storm sail might be rigged over a furled genny. This would support the halyard above the sail and below the masthead.
I still suggest you get someone to look at backstay and forestay rig and tension as well as mast