I can totally relate to what you are saying. My exHs barrister manipulated the FDR to look a certain way. I wasn't represented, had no idea what his case was because I wasn't given a position statement and the judge waffled on based on the lies he had been told. The actual outcome was very very different. They were trying to frighten me into a low settlement.
However, I stuck with it got a barrister for the final hearings and ended up with a very good, clean break settlement which has allowed me to retire early.
If I were you I would make sure you have cast iron evidence of everything asset wise and document it for the court well in advance. I am assuming that your exHs pension is some variation of a 'final salary ' if it's armed forces and the CETV is a lot lower than if you were to finance its benefits in a defined contribution pension? Ie you would need a lot more than £400k to generate an equivalent annuity?
The risk to you if you are aren't represented is that your xHs barrister will steer the hearing away from the relevant issues ie, short marriage, relative financial positions, his ability to house himself etc. You only get limited opportunities to speak in court. If the other side lies you can't correct them. You need to make the most of your questioning.
The applicants side also control the bundle for court which is all the documents that the judge refers to. I didn't see it until the hearing and it contained some surprise documents and excluded some I had sent to them. Make sure you send copies of everything you want the judge to see to court beforehand and point out if they are omitted. I think one of the emails they produced was a forgery!
I suspect, from my experience, they are trying to bamboozle the judge at final hearing in the hope he won't notice the things that are relevant to your case. My exH had zero case which became apparent in the hearing.
Your questioning of your exH is your opportunity to bring everything to the judges attention. I would prepare and rehearse your questions. Don't expect the judge to read everything, they don't. I am not a lawyer but I would be asking your XH where he was living since 2012, how he paid for it. Where he is living now, how is it paid for. Why does he need a deposit for a house if he has never owned a property. Make it very clear why he hasn't contributed to your house and the effect of giving him a lump sum on your ability to house your children. Also your exH will be able to access his pension funds at age 55, possibly earlier.
I can totally understand your reluctance to use solicitors under the circumstances. The court system is a shit show for manipulators and liars but you sound like a fighter, good on you!