It took some trial and error but I’m pretty sure I found the strings that came on my Vintera mustang that sound perfect on those guitars. The guy said Heavy Bottoms but after autistically measuring the string gauge with multiple sets of calipers and matching the color of the string coating, I’m 99.9% certain they are in fact Power Slinky’s. I wasted ~$30 dollars worth of strings but it was worth it and gave me some practice on changing strings with a mustang vibrato. Going to take some time for them to settle and age, but they feel very close.