Various solvents are added to those substances which are very hard, or very viscous to help in compounding. Oakmoss, Treemoss and Benzoin are all let down with various solvents. The most common are Benzyl Benzoate, Iso Propyl Myristate and Triethyl Citrate. If you think your Oakwood 50.0% is still too viscous, or too strong then dilute away. As you are keeping notes, you know what you have done, and you know what the final concentration of your diluted solution is; don't you?