Hey Flexican,
braking is one of the most important things on Blackwood and the more effective you can brake the faster your times will be. I know it sounds obvious, but trust me with some propper trial braking you can do some pretty decent times. Also, try to minimise the time between switching from brake to gas, you can go through most of BL corners with full throttle
I did some 400 laps with my G25 and my PB is 14.03 so far...