How can I increase miner fees with each added spend at around 0.1 or 0.2 sat/vB ? Is that no longer doable?
No, with recent electrum wallet pattern of calculating fees, it's no longer doable.
This is because unlike initially when Electrum permits a slightly higher fee because it reuses the transaction inputs and you only pay the Delta,
Currently, it has updated it's transaction logic on fee rate calculation and when you send a new batch transaction, it recalculates the fee (ancestor+child) and set the fee to meet mempool acceptable package rules.
The time you wouldn't spend more with the current update is when the mempool is near empty, or you manually construct a raw transaction.
The only possible way around this now is using electrum console to manually create a raw transaction which will give you more control over the inputs, outputs and fees rate.