Welcome to the adventure of Logosol M8 ! I purchased a used one last year. It was barely used, packaged with a refurbished MS660. I must say I'm dealing with pines up to 60cm diameter and 4m long. This is really pushing the Logosol M8 to its designed limits. With such large logs, I don't think I could manage with less power. Fortunately, I've got a farm tractor with a loader and forks I use to carry the clean logs to the Logosol ramp. I carry several chains in my toolbox and I change them whenever the cut slows down. I sharpen chainsaw chains later in batches. Even if I could find an affordable bandsaw, I doubt I could do the sharpening myself. This keeps the cost of operation very low. In my humble opinion when high production volume is not a priority, Logosol M8 is an excellent tool.
I'm a little surprised you have chosen a MS390, 64cc saw. Logosol recommends a minimal level of 90cc. I see it can use a bar up to 63cm, but it comes standard with a 50cm bar. I read you are planning to recycle hardwood logs into fine lumber. With a less powerfull saw, it will take even more more time per cut, especially on large diameter logs. It may be OK if you are mainly dealing with smaller logs (30-40 cm). I would advise you consider getting a set of bar compatible with narrow kerf chains which are saving wood and cutting faster than regular ripping chains.It will also leave a smoother finish, by far better than any bandsaw mill. The shorter your bar, the least power you need on the chainsaw. If you have enough of a 50cm bar for your logs, you could typically use Lo profile 1.3mm gauge picco ripping chain. It will really stretch the power of your little saw to the maximum.
I personnaly replaced my log original log clamps with stronger ones (M8 LOG HOLDER XL) and I appreciate very much the big claw grip for the log end.
I hope you have fun !