Use 2nd pillar to compensate for salary loss?

Do you guys know, is the contribution by the employer treated differently tax wise compared to my salary they pay me?

Backstory:
I work at a small-ish office and am in sort of a leadership position (it’s difficult to really explain as it’s not that hierarchical and it’s not a typical office job). I have had the good fortune to be able to negotiate a very good starting salary when I started because of fortunate timing.

They offered me another contract where I would earn part of what we charge the customers (I don’t have a fixed salary, but I am also not self-employed or a contractor - they cover my social contributions and insurances). This was at the beginning of 2024 and it increased my salary but I also upped my productivity - for context my “sales volume” increased twofold, my earnings increase 1.5fold.

Anyways, my boss seems to be happy with my productivity, but also seems to want to change my contract again. It’s a lot of fluff, but his arguments boil down to: You earn too much compared to the rest of the industry and it is “not fair to the others in the industry” (mind you the second contract was their idea) or your co-workers who joined later and will not get the same contract/compensation.

I’m not sure if I have much of a say and if I want to stay here, if I just have to swallow the contract change. I don’t expect it to decrease by a lot, but still, why should I be rewareded for my work by having my salary decrease.

Since it’s a small business I wonder if I can compensate some of the loss by discussing a change in my contributions to my second pillar.

I already have negotiated (because I was told by a Treuhänder I once talked to) with my first contract to decrease my Koordinationsabzug to 0 (since I’m the primary bread winner in case of invalidity or death, so the pension would be higher - at least that was my understanding). Since I work part time I will not be making much above 132k (I expect to be at about 150k) so I don’t know if the 1e plan is something to look for - as far as I understand it’s only for the contributions above 132k.

I wondered if I can get them to pay some of my share of my pillar 2 contributions to compensate some of the loss, but it’s obviously only attractive to them if it’s treated differently tax wise.

Does anybody here have another idea?