If you do use the second line up as full make sure you measure when the fluid is hot. Even then you can expect the get some fluid escaping through the cap on any driving with hard turns (track or canyon). Not a lot but some.
Personally I use the first line and fluid at ambient.
2010 BMW M3 Coupe M-DCT w/Tech-EDC, BMW M Performance Exhaust, BPM: Stage I / Euro MDM / DCT / Steering, Space Gray / Fox Red Extended, and a Trunk Monkey known as "Der Stig", plus the daily driver...
2011 BMW 135i M Sport DCT, w/BMW Performance Power Kit, Exhaust, and Brake Rotors, Space Gray / Coral Red, known as "Stiggie" with an outlaw F20 "M135i" badge.