the hard part for me is i know i am faster, every race last year i was faster but with less watts averaged ( I went lower a year ago).. I think the complication for me is the 30 watts or so is such a big swing that i can't get the time in areo in anything but zone 2 maybe i should just lower my ftp and see what happens and build from that.... my fit isn't crazy low and its pretty comfy.
insert crappy pic i made my wife take last week
We need to understand the specifics of what we're comparing here:
1. Are we talking about an FTP that is established on the trainer or outside? Or have you confirmed that your FTP on the trainer is the same as outside? It's important to note that a lot of people cannot maintain the same power on the trainer as they can outside so don't assume they're the same *unless* you know for certain.
2. Many people have a harder time maintaining ~L4 power in the aero position vs in the hoods on the trainer. In fact, that statement also applies to outside power. However, just keep in mind, challenges with achieving a certain comfort level at high power on the trainer don't necessarily translate to your experience outside.
If 1 and 2 are the case for you then I wouldn't sweat too much. 30W is definitely a big swing (unless your FTP is something like 300W) but when on the trainer try to ride in the aero position as much as possible (except when you're doing L4 intervals). If you're definitely more comfortable doing L4 intervals in the aero position outside then try to do so.
Bottom line, I don't really have a problem with anyone doing L4 intervals in the hoods (inside or outside) as long as they're in the aero position for just about everything else. Keep in mind, I'm fairly certain that someone will chime in and say that you MUST do your L4 intervals in the aero position to which I would simply respond, "No you don't and I have plenty of evidence to counter that claim."
Just remember that the best answer to your problem can only be addressed when you look at your training from a holistic perspective. If I only focus on answering the question based on what you should do during those L4 intervals then the answer would likely be different because I would have to make assumptions (probably incorrect ones) about what you're likely doing outside of those L4 intervals.