on a sidenote: It's a bit odd that my balance isn't in the explorer. It should be in the top... 30...ish

and is staking as we speak.
If you are looking at the BitTrex distribution, then you are only seeing the amounts of the internal BitTrex wallets (this is the division of the balance of the BitTrex wallet itself)
You need to go to the block explorer, click on the "top 100" and you will see all balances on the GAM network, starting with the BitTrex wallet (which is still the largest one with around 1.3 Mio GAM) then the "burn" address which contains now 511k GAM and then the list of wallets that are staking GAM, starting from 88.5k down.
I presume that you have about 10k in your wallet (that is nr 30 on BitTrex distribution) so that makes your wallet sit on 17th or 18th position on the Gambit rich list.
Not that for people who hold balance on BitTrex as well as in a GAM wallet, their total is the addition of the two, also you can set up multiple addresses in your wallet and divide your balance between different addresses in the same wallet, so you can not always conclude what your position is on the rich list, except that you are not above a certain position.
But it still is nice to see your relative position on BitTrex and on the GAM network - I can find my exact wallet balance back on both,
but I took care to keep all my wallet balance in a single address.
You can enable "Coin Control" and inspect the addresses to which your inputs have been sent - since the number of inputs can run up to 500 this is not a simple task and it is likely that if you used the wallet to send amounts back and forth, that your wallet has split inputs and has now smaller amounts sitting on random wallet-generated addresses, especially if you split inputs in the very beginning to get your wallet's staking and more active with the GAM network, to avoid the max size GAM award.