I have to install a through the wall kit on a small cabin and am noticing that the tee and bracket will likely not give me enough clearance to get past the soffit on my roof. This seems to be a common issue (I've noticed people having to build custom brackets etc). Any advice? The elbow are sort of expensive so would rather not do that. Are there extensions I can add to the bracket to bring it out further from the wall before it goes up? Thanks