I can't tell from Jayco's website if you have an enclosed underbelly or not (seems like no?). If you don't, I would suggest installing an in-tank rinser like the
Camco Tornado rinser. We have a Hydroflush elbow but since we now have a factory installed in-tank rinser, I don't backflush anymore because I find that the rinser does a better job. I still use the clear elbow because you can tell when the tank is flushing out clearer, plus it's fun (in a weird way) to watch the "stuff" come streaming out of the black tank.
Providing you're not in a drought stricken area, the best solution is to use lots of water. Fill the tank with about 4 or 5 gallons before using the toilet. Every time you use the toilet and drop poop into it, flush with plenty of water. Then, as mentioned, fill the tank up before dumping.
When using our rinser, I empty the tank (after filling it up) and then let the rinser run for 5+ minutes while we are breaking camp. Then I'll fill the tank right up again and dump. I usually have to repeat this process once more to get the bottom of the tank spotless. If we don't this, it just makes matters worse on the next trip.
Some tanks simply drain better than others and it depends on the shape and dimensions of your particular tank. Ours is one of the harder ones to empty because it's long and skinny with a low slope on the bottom. Our first TT on the other hand was a piece of cake to dump and we never ever had an issue.
If you have the stock OEM button sensors on the side of the tank wall, they are notoriously inaccurate. We had our dealer remove the button sensors and install
Horst Miracle probes. (Easy to install yourself but we had to have the dealer do it because we have an enclosed underbelly and our TT is under warranty)