It worked fine So you can do this with BTG bitcoin gold also?
So should i stick to my new seed on the Electrum wallet or can i move back my btc to the old seed?
Your old seed should not be used for Bitcoin anymore,you have new one and you use old for claim BitcoinCash.That old seed is only good for claim other Bitcoin related fork coins(at time you have Bitcoin in old wallet), and you can use it to claim BitcoinGold.
There is beta version of BitcoinGold Electrum wallet what would be the easiest way to claim this coin,but it is still in beta version and it is not recommended to use it on mainnet.However you can try it from this link : BitcoinGoldElectrum
It is the same thing like BitcoinCash claim,just use your old seed and wait for wallet to sync.