I believe this would get you what you are looking for. I was thinking the exact same ratio as you and think this would be a great starting point. This should give 2.5 MCG a spray of TUTH.
The 5 ml bottles I read some where they are around 84% per spray of the 30ml. I will dig around here and look for it
Pharmacies and car parts shops usually sell small measures IME.
And yes, go for the better quality ones with the etched/moulded-in markings! 
So I mixed this up yesterday and tried it out. Not the expected results.
Each ingredient was measured at 1ml for a total of 4ml.
I plan to try again today to see the results.
I would say the results of this are about 25% of the results I see from just doing two sprays each of TUTH regular strength and TAC 10mcg.
On a side note.. I found a medical supply store here in my town and the gentleman at the desk just gave me 4 syringes that are used for administering medication for free. They were 0.5ml so I would fill them up twice.
Same here Jdub. I’ve tried mixing TAC + TUTH together and didn’t get same results.
There was a vendor that added Hedione to their products and it did not work well so they removed it again. So could be the Hedione breaks down some molecules or messes up diffusion properties.
Separate, nearby app points works best for me. I have ordered some Hedione and look forward to testing.
That’s interesting because I usually spray the TAC right over the TUTH..
TAC and TUTH are usually fine sprayed or mixed together. Its maybe the Hedione proportion that needs work - IME you don’t need a great deal to get its social/feelgood moderation, and maybe 25% is too much.
Personally I do keep its app points apart - but I have oversprayed hedione-based colognes to good effect.
Yeah I’m thinking it has to do with Hedione being mixed in as I always spray TAC over TUTH and usually spray Hedione elsewhere. But I too have had my fair share of spraying Hedione slightly over the TAC/TUTH.
I notice that with Hedione that it seems to diffuse anything I wear with faster. It seems to make whatever I wear hit harder but not last as long.
I haven’t got my shipment in yet but I will make TUTH/TAC mix with and without the Hedione in the smaller 5ML bottles and test this.
I am thinking maybe some things just shouldn’t be mixed together. I have made some pretty bad mixes but when worn separate all the molecules work great.