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I have a 2016 Creator Pro, so my perspectives will be different from yours, but have you tried FlashPrint 5? I've come to the conclusion that it's really much better than previous versions, and I've begun to prefer it for its ability to allow my prints to excel in quality. Recent updates seem to have provided remedies for the ooze that seemed to be present for prints I made using earlier versions.

I can't say for sure that the slicer is to blame for your problems. It may be that precise calibration for your printer could solve more than anything else, if you have any uncertainties about that. Rafts can be troublesome, and so can brims, but you might try using a brim instead of a raft to see if that helps you. Calibration can be confusing if you're just starting out, I know it was for me. For example, what is normally referred to as "bed leveling" actually has less to do with leveling the surface of the build plate than it does ensuring that the distance from bed to extruder remains the same at every point of the printed layer. For my Creator Pro, it's just a fact of life that the rods that support the weight of the extruder gantry bend more under that weight the further the gantry is from the ends of the rods. In other words, the extruder nozzle is closer to the build plate at the build plate's center than when at its corners, and very little can be done about it. Learning to make compromises toward complying with that condition can be necessary to optimize print quality.

However, you must be using a custom build for the Cura profile for Adventurer (as I did for the Creator Pro), because I think that the only profile provided natively for FlashForge Printers (beginning with Cura version 4.9) supports the single extruder Dreamer model. It's my experience that even with the best efforts on the part of very smart programmers, those custom profiles can be subject to issues. Ultimaker, as it seems, isn't willing to divulge all its secrets even though offering an invitation to potential customers. I haven't performed such a search, but it might be worthwhile to see if anyone has created a profile for your printer for PrusaSlicer.

One thing I will say about FlashPrint is that when I first started using version 5, I discovered that the ooze (stringing) was controlled only by increasing the retraction distance to what I would have previously considered ridiculous values. I got better results when I changed the default 1.3 setting to 1.6, 1.8, or even to 2.0 or 2.2. I don't have to make those kinds of adjustments when using the current release.

People I know who have used and trusted Simplify for a long time have told me they think that it has fallen behind. That doesn't mean that it won't work for you, but I'm just saying that it may not be the ultimate and simple solution that you're hoping to find.