How long have they been dragging their feet on the LOD? Can you drill or has the doctor restricted you from military duties? Are you out of your civilian job as well? Either loss of work in the civilian sector and from the military can be the basis for INCAP pay.
If they are not doing what they should, you have the option of using the IG or a civilian attorney (the JAG may see you, but strictly speaking, unless on active duty, you aren't entitled to Legal Assistance; your state may have different rules, though). Other than making them angry, I see no reason not to engage the IG. What you are looking for is three things: An LOD-YES finding, payment of INCAP pay, and referral to MEB and later, PEB. It sounds like you have a strong case, so don't let them put you off. I have seen some situations where they try to "wait you out," and hope you just ETS. But if your injuries were the proximate result of your duties, or were incurred while you were on orders for 30 days or more, you are entitled to compensation.
Please let me know any questions.