Ok, lots to cover here. Let me know if I miss anything.
Using Resonance actions through ware paid for with essence: is there a rules reference here, either RAW or RAI as you see it? Regardless, skinlink will work through cyber-arm, I believe. I don't want to get into "which hand is Sniffles using to hold a commlink," or anything like that.
There is literally *nothing* about using 'ware with Resonance RAW. And there's a been a few arg^H^H^Hdiscussions for RAI on the boards here. I've not found anything even remotely official either way. IMHO it's GM fiat on this one, I can see it going both ways. Personally, I'd rule that if you pay essence for something it becomes part of you thus Resonance would function through it.
Noted on the ruling for skinlink.
Matrix Searches: the info you're looking for is Hidden, so 1 hour per search. That puts Sniffles searching time at 6 hours for 21 successes, or 10 successes for about 3 hours of searching. The 10 will do.
Doh, I mis-interpreted the context of your note on Limited searches. The update makes sense and yes, Hidden not Limited, my bad

The Dixie Mafia connection in Montgomery and Jacksonville looks solid, but the mafia there is not in the Chavez family, which runs DFW and most of Texas. It's very difficult to prove a negative, but it seems the DM in the DFW have their own casinos -- one or two of which Sniffles was surprised to find that he does or has frequented in the past without knowing that connection. Mr. House could still be small time here; he could have successfully resisted any mergers; he could pay a small protection fee to the DM, or the yaks for that matter; but Sniffles has not turned up any direct and sustained connection between the two, and he feels fairly confident in his google-fu on this point.
Time: Sniffles spent half an hour getting home, 3.5 hours doing his matrix search on Mr. House, 5 hours Compiling the would-not-be-compiled sprite, and 3 hours sleeping. That puts him at 12 hours out from IC time, so we're at 06:30 on 21, APR. Tip-off's at 19:00 CST, but the closer to tip-off that Sniffles does his work the less time Slim has to profit from it. It is a Sunday morning, so Sniffles probably has a shot at Compiling again before he gets to work.
Good to know he's that even if he's stepping on a few toes, they aren't serious ones

He'll risk the 5 hours to try and register another Sprite. Even having one just to sustain a form for him will be a big deal.
Oh, and is Slim a man or woman?
I had envisioned Slim being a man and think I've referred to the character as such, but I'm not stuck on that. Slim being a woman would totally work.