I buy totals and repair them all the time, I typically fix and drive them myself, once I am ready to move on, then I sell them. I haven't flipped in awhile, I did it a bunch in the past and had both good and bad results. Personally, it's only worth it if you can get quality work done at a good price (luckily my family owns a shop and I have access to everything) and you are able to reinstate the title to clean status in your state (unless the person/business you sell to doesn't mind a salvage title, which depending on the flip price might be rare considering insurance options), in your case, it sounds like you are looking to get some decent money out of the cars so if your state prohibits reinstated titles, and the cost of the work+the salvage is anywhere close to ACV or flip price, no, it's just not worth it IMO...
DOCUMENT EVERYTHING, KEEP INVOICES!