I found that the less I said to my vet(s) the better. They tell me what to do, and I smile and nod and acknowledge that I heard them...and then I go home and do exactly what I've been told to do by the fine folks here on the FDMB.
After multiple times of minimal engagement regarding Luci's diabetes it seems they lose interest quickly. If they ask I will share my Spreadsheet, often they want to recommend aka sell me some DM food - I decline politely...pay my bill and leave. They usually ask me to call them regarding modifying her dose - yeah, right...not gonna happen. Not one of them has ever called me and said, I think you need to change Luci's dose - although one vet asked me why I kept moving it up and down (well based on the numbers, was my response) and that seemed to be enough for him...
I'm sure you know already that with thousands of people here who've done it all, seen it all and been there done that -- with schedules and families and the whole nine yards - they have better outcomes that 99% of the vets who attempt to manage FD...
Well, that's my opinion...you may of course keep a good relationship with your vet, just dial it down as far as your expectations of the best advice for managing Jade's FD - starting with recommendations about using the pen needles vs syringes - you're comfortable using the sryinge, the advantages of using the syringes are many (as Wendy pointed out above)...go right ahead and use those sryinges - no point in arguing that point with your vet - she feel one way and you feel another - your cat, your judgement...do what's best for Jade.
Have a great evening!