I also go through the VA. I have no idea why the push for patches and pills recently. I am getting the same issues in Seattle. I'm going to assume that part of the injection "issue" is going to be the added cost of needles, syringes, and disposal. My second thought on the switch is that they know that with injections your E2 levels are going to be very high initially and that they taper over a week or so. I have a feeling that the "spike" is their issue.
Side note: Estradiol Valerate is a bioidentical hormone as I recall.
If there are a lot of others that are being pushed away from EV IM injections, I'd assume that they are probably trying to remove it from the formulary. Which would make it a special order, and a more expensive medication. There have also been a few instances of limited availability, which may be influencing the change to a more readily available method of administration.
The biggest issue I have with the proposed switch is "quality of life". I'm on weekly injections and I find it far easier to manage a once a week injection than to remember to pack around extra pills, or patches. Remembering to take them on time, remembering to check if the patch is still on and hasn't come off. I'm also on prometrium with other transition pills (finasteride, and spironolactone), I'm a little embarrassed to say that I constantly forget to bring them with me (or take them in the mornings). However, I always remember my injections (mainly because I feel terrible at the end of the week.)
I can't speak to the potency of EC vs EV, but if you have the moderators move the post to the Hormone section I am certain you'll get your answer.
Best advice is to stick to your guns on why you don't wish to change. I've successfully won that battle consistently over that last 3 years, and am still on injections. It recently reared its ugly head again. With my upcoming GRS, they want to switch me to pills because my dose on injection would be very small... sigh.... I am still pulling the "quality of life" card. With constant dosing, I can't really live my life.