u must gain enough momentum to make a better drift for both corner. try use the feint motion for the first corner. here is my explanation.
after the straightaway, (in the 5th gear) shake your car a bit brake smoothly just before u going through the bridge shadow and drop to 4th gear. turn the steering to the left and when your front car just arrive at the kerb on the left brake hard and at the same time turn your steering to the right. your car will start to slip and drifting in the middle of the road. press the e-brake a bit if u need more momentum to push your car further but be careful, too much your car will ened up out of the track at the second turn. since u need to drift until the second corner, concioulsy take a glance on your right for the kerb. just before u get pass the kerb, brake smoothly and drop to 3rd gear. control your throttle and try to maintain a half turn of your steering.
for the 4th corner, u need to do another tfeint motion but withour using the brake. just shake your car a bit to the right and then when u fully turn your steering to the lecft, let go the gas. when u get the angle, smoothly setp on the gas back and also here, try to maintain the half turn of your steering. with sim tyre u won't have difficulty for both corner but a bit tricky with hard compund racing tyre (more e-brake apply).
well i hope this might help u. sorry for my bad english cause i don't know much of the vocab and terminology in the method i used. right now i'm practising for the long corner at the apricot hill and tokyo route 246. mostly ended up drifting 3 quarter of the corner.hihi