@ Thomas29 Sorry I hadn't been here for a few weeks and haven't read your message.
You don't need to worry about the storage and possible degradation of the diclazepam as long as it's in a pure propylene glycol and/or ethanol solution with no water. PG and Ethanol both have conserving effects and are useful to stop degradation and (fast) evaporization in many products like flavours that are mixed with PG for food, e-cigarettes etc. If you've made a strong solution you can use pure PG as you don't need to take high doses but I recommend to replace every couple of milliliters you have used with ethanol or PG so you get a weaker solution, then take your usual amount of ml and if it isn't enough you can take more but it's helpful to trick your brain a little bit.
You should keep in mind that diclazepam has a very long half life even compared to clonazepam so it will accumulate until a steady state is reached but I don't know how you can calculate this from the relations of potency/duration/accumulation etc. and it's further correlations with the increasing tolerance due to accumulation. I made a thread about this but it seems no one who knows more about this has replied yet.
https://www.bluelight.org/vb/threads/861248-Benzo-Tolerance-Long-vs-Short-Medium-Half-Life
I guess due to the long half life you shouldn't get those rapid withdrawal symptoms as with clonazepam. It seems strange that even such small dosage variations can cause withdrawals to occur, have you thought about supplementing the benzo with something else like Kava or other sedative herbs? It would also be possible to use pheni but to taper off or augment benzos but I can't recommend this as an medicinal advice because many people seem to get quite easy psychologically and psychosomatically addicted to it even though it's really easy to taper down in contrast to a real benzo addiction.
I would say it can be psychologically similar addictive to cigarettes but there are not those rapid cravings as with nicotine which has a slow half life. I use it almost constantly/daily since 2013, I must say that I have an addictive personallity in many ways and the first time I tried it I somehow knew that I'll gonna take it everyday from now on as I was so amazed by the effects, there was quite a hangover the day after I used about 1-2g for the first time so I took some more thinking it would elevate the fog but from there on I took it constantly in doses of 1-2g and since ~2016 3g but usually not more and sometimes less. When I don't have anything as I often delay my orders very long it takes about 24h to feel the need of taking another dose (I got somehow even more lazy in the last years than usually, I also smoke synthetic cannabinoids since 2010 daily 24/4 but since 2016 as the npsg-law was passed that made all indole- and indazole cannabinoids illegal along with the trend of there being more and more insanely potent cannabinoids (200-1000 times stronger than THC like 5F-ADB, MDMB-CHMICA, MDMB-Fubinaca and SGT25) which aren't really enjoyable as you almost never find the sweet spot between to little effects and the feeling of getting a seizure or something else every second along with being way lass psychedlic than the holy-grail cannabinoids JWH122 - &210, AB-Pinaca and AB-Fubinaca (in my opinion) so my mood, motivation, creativity I had from those good cannabinoids vanished over the time. It really sad, 2012 when there was plenty of AM2201, JWH122/210 and much more available I had the best time of my life, it was like a constant light "enlightment" from the psychedelic ego-dettachment through the noids.