I have used both glycerin and Sanitin 17 but I have never used a set amount
if you were going to use glycerin and sanitin, I would suggest adding it in the following manner
1 - rack your wine to your primary, fill a wine glass with 4-6 oz (a ladle works well)
2 - fill up another wine glass, add a bit (1/2 oz) of glycerine and stir till blended, add to pail and stir well, draw off another small sample glass (don't mix up the glass that you use to stir in the glycerine)
3 - now taste your first sample and then the second, note the changes and hopefully improvement, you may notice a lengthening out of your wine flavour and a thickening in the wine body
4 - repeat the step 2 and then step 3, taste all three and see if you are noticing any improvement
5- you can repeat 2 and 3 again and again till you are satisfied with the results, don't overdue it, you can't remove once its added
Adding the oak, be careful with this stuff as it will really change the taste of your wine in a hurry. get a small syringe that can measure in milliliters
6 - add 1 ml of liquid oak to your pail and stir, draw off a sample and compare with your last glycerine sample, you should note a lengthening of your wine flavour, it will seem to last longer on the tongue
7- you can continue to add oak till you are happy with the results, I myself would not add more than 3-4 ml unless you really like your wines oaky, I can't imagine what adding 15 ml would do and I'm not about to find out
You might find it helpful to continue to refer back to your original sample as you go. The difference between the two will be quite surprising. Your wine will continue to age and change over time even after tweaking with the glycerine and oak.
Just remember to add slowly and taste. After 1 or 2 times of doing this you will better know what to expect.
Putterrr