If the speed is not a factor, just stay where you are. Progressives are for speed, why they wre made. I am NOT a Lee guy, don't care for their stuff, but the turret press is a decent press. Their progressives are sad, but many like them becuase of cost. All produce the same level of ammo.
Your powder drops can be made better by switching to a an adjustable measure. It will give you more range. Don't let the OCD get to you on OAL, a variation of 0.005" is pretty normal, bullet noses vary that much & using mixed brass always causes minor variations.
The LNL is an ok press, I have run my buddy's a bit, & if you never want a case feeder & like auto indexing, go for it. You may have to tweek the priming system a bit, but it's workable. I like the 550 a lot, very versital & the manual indexing is no slower than the LNL. If yo umust have a case feeder, the 650 is a better press, hands down. Equipped the same as the LNL, it's less than $100 more & worth it IMO. Better priming, better case feeder. The powder measure is accurate to 0.1gr with all ball & most flake powders. Stick powders in ANY measure are going to cause issues.
In the long run, equip is cheap, even the best setup is a cup of coffee a month over 20yrs of reloading. Good equip will last long enough to pass on to your kids or grandkids.