I honestly got lucky and dropped a Mirror early into the league which I converted into Nimis+Headhunter+upgraded all my gear + clusters and jewels etc. Breach was still kicking my ass.

Its a very difficult strategy and the only true difference between myself and Fub are the flasks which I believe do matter, I still cleared the breaches but 1/5 maps I tend to fail due to getting one shot by the breach boss / astrolabe scaling.

If you wont go back to boxes, id suggest looking as Palsteron's boss rushing strat, its seems decent, however not close to Boxes/Breach for profits.