When you bottle, is you water jacketed bottler in a cold environment? I've had times in the past, when bottling, that I get lots of condensation on the under side of the bottler cover. It's possible that could bring the density up too high. What I do to counter act that is about every 45-60 minutes I lift the cover and get the condensation to fall back into the syrup, then I stir to blend it. If I'm packing all larger contaqiners this is seldom an issue, but smaller containers take more time to empty the bottler and it can happen.
On the flip side, don't dump too much back in when your syrup level is low or you could end up with under density syrup and get spoilage.
My bottler holds 16 gal, it can take me 2 hrs to empty it if filling qts, pints and smaller doing it alone, which is 98% of the time. I do my last dump back in at about 1/3 full, stir and proceed, never when lower in the bottler tank.
If your bottling area is heated that's not likely to be much of an issue. I don't get much condensation when I bottle with the air temps above 75.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.