Please don't take offense to this, but it kind of sounds like you are being too picky on the barn. Lots of people don't shoe the horses in winter. Lots of people don't supplement horses, growing or old. And lots of people don't blanket ridden horses. I am in S. Alberta, and I fit into every single one of those categories.
Give it a chance, I'm guessing from what you were paying at the last place that every horse had everything short of a mint left on their stall bedding, so of course this place will be different.
I read the problem training thread you started. I think just sit down with your trainer and him alone. Tell him what "Lancer" has had done, how you handle him and what you want done. Is he actually going to be training "Lancer"? Or giving you lessons? Make sure you are as open minded as possible to his ideas when you two are talking and discuss how to incorporate them into ways "Lancer" is okay with. Not saying you are closed minded, but when I was 15, I knew everything and my mare only did things my way and I never even realized it until she dumped me and ran home leaving me and I got a "told you so" lol.
If you are a good rider, maybe just ride yourself, getting pointers from him on a specific thing or finding other trainers to consult with. It might be better in the long run to just pick your own methods than moving from different trainer to different trainer, especially if he is already developing fighting tendencies to any new technique.
I don't know where you are, but you can pm me where you are located if you want. I know some people who have been working in the horse industry all over the province who may be able to recommend someone if you are having such a hard time finding any trainer who can work with your horse. It may help out if you wanted second opinions or this current guy doesn't work out.
Are you allowed off-site trainers to come in and give you lessons?