"... my representative isn't beholden to my area."
How the system works in Scotland and Germany is that you get two votes.
You get one vote for the MP for your constituency, just like at the moment (although the constituencies would be bigger). So you will always have a constituency MP.
The second vote is for which party you want to govern.
In Scotland, whoever wins on a FPTP basis in each constituency becomes the MSP for that constituency. In Scotland there are 73 constituencies and so 73 constituency MSPs.
The second vote is then to decide which particular party you want to vote for and it is this vote that decides who the extra MSPs are going to be.
What happens is that they work out how many MSPs of each party there should be according to the party vote (it's called the Regional Vote in Scotland) and then award places to candidates from each party in addition to their constituency MSPs to make up the numbers to the percentage they got in the Regional Vote.
It's probably easiest to explain with an example.
The Conservatives won, I believe, five constituency seats (which is 6.8% of the constituency seats) but in the Regional Vote they got 23.5% of the votes and so ended up being given another 26 seats to give them 24% of the total number of seats.
The Green Party didn't win a single constituency seat at all, but in the Regional Vote they got 8.1% of the votes and so ended up being given 8 seats or 6.2% of the total seats without winning a single constituency vote.
So, for example, the well known Green MSP, Maggie Chapman, (who said that the Supreme Court justices were bigots for saying that women are women) was never personally elected in any constituency. She got her place because the Greens were awarded 8 seats in the Regional Vote and she got one on them.