Just an update, I installed the system and had pre-ordered some fiberglass tape expecting the drone to be bad with the factory tips. Without the tape it really wasn't bad, but in that low range with load, it was noticeable. With the different drive settings, it's not too hard to stay out of that range if you really care. If I hadn't pre-ordered the tape, I probably would have left it as is. Overall I am very happy with the sound, it's just what I wanted in terms of tone and volume, enough to be noticeable as more aggressive without having to worry about waking the neighbors.
Since I had the tape anyways (
https://www.amazon.com/gp/product/B01KVYH66U/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1, 1 roll is enough for 4 tips ) I went ahead and wrapped the pipes just ahead of the tips, then slid the roll up into the tip. What little drone was there is gone, it's almost like going back to stock as far as interior noise. I do not have any soundproofing in the hatch. The wrap has the added benefit of centering the pipes in the tips and looking better from the back, where now you do not see a gap between tip and pipe.
For more detail on what to do, here's what worked for me: I laid under the back of the car, took the tape and wrapped a couple of turns on the pipe, just before the tip, and put a metal zip tie on it to secure it. Then I just kept wrapping, tightening it every couple of loops, and testing it against the larger mouth of the tip. Eventually the fit is snug, and you can shove it into the tip opening about an inch if you shift the exhaust pipe to be centered within the larger tip opening. Then you can use more metal zip ties or baling wire to secure the wrap, both in a loop, and to the exhaust tip frame, so it does not unravel or slide back. Here's a couple of pictures of the finished product:
I had to angle the flash just right to get the tape to be visible from the back, in every other case you cannot see it.
Hope this helps.