Tons of questions

[Gumby_Damit]

Hello yall!!! So, I've decided to get into the craft and start with rum. Ive made a couple of batches with moderate success.... I think. I mean I havent gone blind, so theres that lol. The rum comes out tasting "sweet" and has great flavor. But, of course I want to make it better.

A few questions:

If I take what's left from the still after the spirit run and place it in a bucket to "ferment" it is dunder. BUT, If I put it in a jar and do NOT allow it to "ferment" then its Backset? Or are the interchangeable?

When adding dunder, I dont want to use more than 25% of the total volume correct? SO 1 gal of dunder for 5gal of wash? And add it to my spirit run?

I have noticed that once my distillate goes below 50% abv it starts to haze. I figured this was due to there being more water in the final product. Is there any way to keep it clear once it reaches below 50% abv? Would a small column with 2-4 bubble plates help this?

This particular question kinda goes along with the previous. When proofing down my distillate, what is the best method for doing so? Adding water? What kind (tap, distilled, spring)? How can I keep it from hazing?

Ok, Last one for this post. Temp control. I have a thermometer at the kettle and the highest point in the still. What temp should I be paying the most attention to? Should I worry about the wash boiling, or should I just make sure the steam is at the right temp at the top?

Thanks for the input and answers. I look forward to discussions on this awesome spirit.