Yeah because it is all new to me I didn't know how much head space I needed so I left a bit too much. I also put in in a bucket, something I did not need to do but better safe than sorry. Having made beer for about a year now I can say I will definitely have a hard time waiting as long as I should for this.
Patience young Jedi!
You'll quickly learn that with meads, while there are a few techniques that can mask flavours, generally it's down to time.
I say mask flavours, because batches of young meads, often don't taste how you think they should. It's made with honey right ? so it'll be sweet right ?
Well, no. It won't be sweet. All, or at least most of the sugars will have been fermented away, so you just don't get a sweet flavour. Many young meads can taste hideous.......
Of course, it depends on the recipe, but using beer making technique, like "all the fermentables in the brew up front" is often bad for meads.
If you think about it, a gravity drop of 133 points equates to 18% ABV, so to get that (presuming finished as 1.000) you'd need a gravity of 1.133 too start with. Now that's doable, but still a bit on the high side, and if you wanted to make the batch strong, but with some residual sugars, then numbers increase accordingly.
Bad, bad, bad.......
Much more likely to be stressing the yeast and if you go too high, you can cause the yeast to suffer osmotic shock and it sometimes, won't start at all.
It's better to check out stuff like "step feeding", along with "staggered nutrient addition"/SNA, and use those methods.
You want to look after your batches, and do everything possible to prevent off flavours etc.......