I read a post over at the CM forum about a guy with the same problem.
I think that he qualifies for races (Pro level), with KERS but without using DRS, and only using lean fuel.
On race day, he can use KERS & DRS, but again only uses lean fuel mix. He thinks it's nice and challenging, with lots of mid-field battles, rather than stepping up and being hammered by Legend settings ....
if you're comfortable editing the database(really very simple) then you can also tailor each tracks difficulty to suit you. Its what I do to make legend more raceable but still a challenge compared to pro which is cakewalk
Check my thread over in the mods section, I've put together a table of new track_difficulty values (what controls difficulty between pro/legend) you can mod your database.bin with. It's still a WIP but I'll be taking suggestions as time goes by.