Cool, I used Rally Design Group N Maxtorq discs when I did my conversion, brilliant discs for money.
I only found them after doing some research on a track day car forum, they came out top of what lats repeated abuse on track days, way above more well know brands which on average lasted half as long.
By going from a smaller grooved disc to a larger flat disc you have increased the surface area by a massive amount, braking should be massively improved now.
Get them, bedded in properly, 4-6 hard stops from 60-10mph not allowing car to fully stop, followed by a period of colling never allowing car to fully stop, a nice drive at constant speed down dual carriageway/motorway should do for 10mins then 2 80-10 stops will have them bedded in a treat!