Blade enchant effect is removed when in Force Enchanter mode. Penetration, damage reduce and accuracy from blade buff is also removed. But because of Astral Enhancement, you don’t have to worry about the lost stats.
In the previous patches, it was necessary to cast Battle Aura before Force Enchanter for stronger BM1 and additional critical rate. Battle Aura adds a little magic attack which in turn strengthen your BM1. With Rising Force patch, because of Astral Enhancement, it is not necessary to cast Battle Aura before Force Enchanter. Instead of casting Battle Aura before BM1, use it to extend BM1’s duration.