Some questions about restaking and eigenLayer

I'll skip the part explaining what is restaking, the following questions of for people that are already part of it.
I saw that there are bonuses joining early and even more bonus if we join by swapping ETHx.

First thing. I have stETH (lido) so in order to get the bonus I should swap to ETHx (stader) first and then to rsETH (restaked). So I went to DEXs but there is multiple ETHx. How can I make sure to target the correct token and not a scam ?
I believe the official contract is this one: https://etherscan.io/token/0xA35b1B31Ce002FBF2058D22F30f95D405200A15b
is that correct ?

Secondly, I entered this address inside the DEX and got weird numbers. the pair of LSD ETH tokens should be about ~1/1 ratio. But yet to get a ETHx I have to spend ~ 1,05 stETH. And when I look in the other way around: swapping 1 ETHx would get me just 1,01 stETH back. This means that a round trip (stETH -> ETHx -> stETH) would get me a 2,2% loss. That's a huge loss, that's almost one year of yield at the current rates !
Is that normal and why is that ? Both are literally LSD tokens working the same way.