Pressure on vector brushes

I use the vector brushe all the time for hand lettering in fresco but this week the pressure sensitivity just seems off and no amount of plating around with settings seems to set it right. It's like the pressure sensitivity is dulled somehow.when I start my stroke with very light pressure (for a thin stroke) and then mid stroke increase the pressure to transition to a thicker stroke, the thickness barely increases. Same in reverse, I cannot go from very thick to very thin as I used to for hand lettering. I hadn't changed any settings so has there been changes on the back end in fresco? I tried the same thing in illustrator for iPad and everything is fine there so it's not an iPad setting problem? Am I missing some setting in fresco?