My Skink is Hurting Himself

[samkoolkid14]

I am a recently new BTS owner. I bought a male Irian Jaya from a reptile show a couple months back, he has been happy and healthy and hasn't had any issues other than this..
http://postimg.org/image/5seknwdr9/

He is hitting his head on things. The tank that I bought for him is an Exo Terra 55 gallon wide tank, I am sure most of you know you can buy styrofoam inserts for tanks. This tank came with the styrofoam when I bought it.
http://postimg.org/image/wtk48xqtp/

Unfortunately my skink (his name is Blue) always tries to climb on it. The tank is latched at the top so I have no fear of him escaping or anything. The problem is I don't know how to keep him from climbing the foam. Each time he climbs it he tries to open the top of the cage for a few seconds and then loses his grip, hitting his head on things in the process which is what you see in the above picture. His head is all scabbed up and I am worried if I don't do something about it he might end up getting a concussion or infection, not to mention it just looks terrible. I like the way the foam looks aesthetically and it hides the cords of my thermometers, I would like to keep the foam if possible but at this point I am considering just removing the whole thing if he keeps being dumb.

Does anyone have any ideas?

[Susann]

If he is getting that banged up from falling off the side, then I'm afraid there probably is no other solution than to take the insert out. Unless you want to build up the bottom so he doesn't fall so far.

[Edward]

And I would follow Susann's recommendations.

[samkoolkid14]

I go through about one large bag of aspen substrate every two weeks and at this point I can't afford to buy more. I guess if there is no other way there is no other way.
I would rather he be safe then keep the foam just because it looks good.

Plus on another note the foam is kinda melting on one side because of a heat lamp and I don't want that to turn into a fire hazard.

[Susann]

I go through about one large bag of aspen substrate every two weeks

Whoa! That's a lot! It's great of you to change it all out every other week, but most of us find it plenty clean enough to just spot clean when we see poop. I change out all the substrate once every three months or so.

Plus on another note the foam is kinda melting on one side because of a heat lamp and I don't want that to turn into a fire hazard.

Whoa again! Yeah, if you can't move the heat lamp, I'd say the foam has to go.

[samkoolkid14]

I took out his styrofoam background last night and I he hasn't made any of the usual escape attempts.
Luckily I am taking him to get his nails trimmed at the vet soon so Ill have them take a look at his head while I'm there just to be safe.