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DELL XPS 15 9550 - CPU speed cap on battery

So, as most 9550 owners, who watch this forums probably know, the recent BIOS update 1.1.15 is supposed to fix CPU Speed cap after pulling the AC cable. People in another thread stated, that their processors now run at full turbo on battery. 

However my CPU still runs at 1.69GHz max on battery after the BIOS update, while the base clock of the 6700HQ should be 2.6GHz. Plugging in the AC cable now instantly goes back to full turbo, which is fine.

What makes this worse, is that the CPU clock under battery and load climbs painfully slowly towards the 1.69GHz mark, starting at 0.6GHz and taking 20 Seconds to reach 1.69GHz. This still only happens, when pulling the AC cable while the system is running. When im booting freshly on battery it jumps instantly to 1.69GHz under load.

My config is: UHD Disply, 6700HQ, 512GB SSD (PM951), 16GB RAM, BIOS Version: 1.1.15

Is anyone else still having these issues after BIOS 1.1.15?

Thanks alot folks

Also when stressing the CPU, Windows logs show "the speed of processor 1 in group 0 is being limited by system firmware" for each logical core, no matter if booted on battery or pulling the plug afterwards. 

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