I 2nd, 3rd, or maybe even 4th the posts above.
- You can really dump at almost any time. The common advice given on here is fill it to 3/4 tank before dump. But you can go to half tank and it won't be any worse for draining.
- It's a tank full of poo, there's no real benefit to cleaning it; Especially if it's in constant use like yours, and not sitting for a week before uses.
- Make sure the vent fans are off before you flush.
- Check or just replace the air admittance valves. See link in post above.
- Add more chemical if it starts to stink. Though I somehow don't think this will solve your problem.
- There's no benefit to keeping the paper in a can. The tanks are smooth sided and the paper will just flow out with everything else, go ahead and flush it.
- RV specific toilet paper is a waste of money.
- You can use whatever septic safe paper you want. I use Costco Kirkland brand and have not had a problem in 13 years.
- See the link below to this guys videos about dumping. They're entertaining and informative.
Link