First, one of the main detriments to shallow-cycling Flooded batteries, is that this can cause Lead Dioxide to clump on the positive plates. This can be mechanically damaging to these batteries. Most battery manufacturers plot Cycle Life from SOC of 90% and below. Cycling these batteries with less than about 10% DOD is not good for them in general.
Regarding measuring SGs, it is usually best to draw and return two or three samples on each cell before drawing the sample on which the reading will be taken. Be certain to hold the Hydrometer vertical as the reading is being taken.
The Measuring SG article, linked earlier in this Discussion is a good summary to get good results in measuring SGs. Just make certain to rinse the Hydrometer at least three times with Distilled Water when you are done measuring SGs.
Bulk / Absorption: 29.8V
Charger (or Charger / Inverter):
Bulk / Absorption: 30.60V
Charger Current: 50A
Absorption time: 4 hours
Equalisation time: 2.5 hours
Please note, the above voltages are based on the below mentioned temperature (10°C).