I see your problem, your boom is upside-down.

At 110kegs I was sailing on a lake with a couple of mates when the wind picked up to around 35kts. I was already on what was my smallest board and sail (109lt - 5.6 sail) when I was smacked down. Another mate was next to me with his 80lt and 3.7m sail trying to hold the sail under water and asked if I wanted a go..."Hell Yeah!"
I waterstarted and was on the plane before I knew it! I sailed across the lake, fluked a gybe and sped back to where he was waiting with my gear. Apart from the low boom, it felt effortless.
I'd love to sail with that size gear every time, and possibly could have the last 2 days.