I will probably start closer to 100% and keep it at that for 2018. Think of it this way, you have a choice between holding on to more coins but with lesser value or invest in fewer coins but with much higher value. The more money there is for the project, the quicker innovative solutions can be developped, the more secure and stable the process will become, the more can be spend on marketing ... and in turn the more people will get attracted to XSPEC, which then can start contributing as well.

Also, a little math can be insightful: if you hold, say 100 XSPEC, then the yearly dividend will be about 5 XSPEC or approx. 20 USD at current prices. If you chose to donate 10%, then that's 2 USD per year, or 16 cents a month. I'd rather donate the full 20 USD, as it will certainly help raise the price much quicker and to a much higher level. The "capital gains" will be much higher than the loss of the dividends.

When XSPEC surpases the USD 100 mark, then perhaps it's slowly time to revisit this strategy. At least that's my humble opinion.