MidAtlanticFoil said..
I went from an 1850 Armstrong to an HA1325 for light winds at 65 KGs. Personally I sold the 1850 after one session back on it after riding the 1325 a few times. Similar lift off for me, but the speed and glide is night and day. Easier to stay up through holes and also to build apparent wind in the light wind.
Demo a HA to see if it will work with your board. I ended up having to sell my 74L and replaced with a 60L with forward boxes to accommodate the HAs.
I'm with MidAtlantic. I'm 75kgs, started with 1850, 1250, 1050. After riding the 925, I sold all of them. Now I ride 925, 725, 525 in almost the same wind range as my first three foils (10-12kts and up).