Sky3DS DiskWriter 1.06b5 has an Optimizer. It basically backs up the game list and savedata from the Sky3DS SD card and does some minor trimming to the .3DS files. I personally pre-trim my game ROMs and am currently using a 32GB SDHC class10 card with 31 games on it (Resident evil, all of Pokemon, Zelda... etc.) and I still have 6.124GBs left. That's another 5 games. Make sure to use new template0310.
Really ticks me off about 31 limit.
BTW, Trimming, or Optimizing, does speed up the cycling. To a degree. Large game files like Resident Evil take a while to load no matter what. But cycling through 31+ games isn't very hard to do after optimization. In fact, I like to pre-trim THEN optimize. Blows my mind.
I also have a POWERSAVESPRO3DS and it DOES WORK ON THE SKY3DS (CONFIRMED!!!).
EDIT: Nope. Only OR/AS/X/Y seem to work for me now.... still need to modify IDs to match legit cart for PS to read it...??? Not sure...
Just don't try to restore save data from your old cart to the new Sky3DS ROM or you'll corrupt the Sky3DS version's savedata. I tried it on ORAS and until you change the Sky3DS ID headers in the template to match the original cart's ID's, the 3DS will create separate savedata files on the SD card (just don't delete them as it creates them inside the ORAS file itself, so do a XYABup reset from within the Sky3DS and your original game will be fine). Once you spoof the IDs it actually reads like the original cart and you don't even need Powersaves. It'll just load the data on the SD card.
But I did use PowerSavePro to max out my $$$ directly onto Sky3DS ROM. Even backs up. Love it.
I am also running 9.5.0-22U firmware. I was on 9.2 waiting for my GW, but it got lost in the mail (ugh!) and my ORAS needed to update.
I can confirm that I am browser injecting from PKHeX into ORAS just fine. About to see if it works on Sky3DS...
I'm currently reading the boards trying to figure out how to rip ID headers from a memory dump, but currently I have no idea how to ROM dump on 9.5.
I also wish I could downgrade so I could get a GW and do a Play Coin Max. Any chance Play Coin Generator can be converted into a .3DS file to be run off of Sky3DS? Hrm? 3DSGuy? Pwuheeeeeze?
Perhaps a way to convert .CIA to .3DS? I also need to transfer my downloaded game's savedata back onto the original cart... Really hate Nintendon't for not thinking of that when they made their transfer tool.
Otherwise... to test browser injection on Sky3DS...
Works. Love it.

Lookatit allz of my pokemonzterz..!!! Now I can rip original pokes from OR to AS without guessing stats or memories! And use my original ORAS cart to play online... Only if I could rip my SFIV and SSB IDs... Then I wouldn't have to carry around all my carts.
So why can't 9.5.0-22U use browser injection to downgrade? I can use it to memory dump and poke inject...?
I'd jizz myself if I could use a GW again...