Those all are known bugs (or features, it's sometimes hard to tell). 1.07 is extremely raw and unoptimized, so some of the "under-the-hood"-features behave very differently when compared to current versions.
1 - In 1.07, the maximum treasure class the monsters can drop is capped at tc66. Somewhere in this thread,
@WoRG had a theory, that when a monster tries to drop a item that has treasure class > 66, the items tc gets halved, and is set to tc33, which results in abundance of Gothic Plates, Griffon Headresses, etc. However, as far as I know, this is just very informed guessing, so the real mechanics behind this have not been confirmed. I'll try to find the post in question for better info. But yeah, it's normal for 1.07 to see those items all over the place.
2 - In 1.07, shields have max 3os, claws have max 2os, circlet-types have max 1os. Not sure about Colossus Blades, but best bet for 6os is to rack an ethereal with no sockets, and Larzuk it in 1.14, it will get 6 sockets. I think that in 1.07 the maximum amount of sockets you can get from Larzuk is 4 for most of the items. This is very convenient when racking eth polearms, since you'll want 4os for your Insigths/Infinities. Also, magic items can get 1-4 sockets from Larzuk, and crafted items can get 1-3. These wont of course exceed the socket cap of the base item, so no easy 4os Monarchs of Deflecting I'm afraid. Still, can lead to really powerful items.
3 & 4 - What
@helvete said. With Frozen Orb, try to aim so that the Orb never touches the enemies. Spam Static Field like crazy. If enemy is chasing you, just FO to the direction you are running to. You'll get used to it. For FRW, keep every FRW charm you find and fill your inventory with them. LK superchests should get you some easily. M'avina's Sharkskin Belt is great item with 40%FRW, you should be able to find a rack quite easily in NM/Hell, and Set items are fairly quick to rack. Same goes with Valkyrie Wing, though racking it can take more time. Circlets have often FRW, but you may be better off getting FCR from your headgear. Shop boots, try to wear light armor/shield. It gets better, and it keeps getting better, since it's not capped.
I can recommend careful reading of this thread. It has answered to almost all the questions I've ever had regarding 1.07. Info is scattered, but it is in there, and this thread is hands down the best isource of 1.07 info in the internet. At least until helvete finishes with his guide
.
Edit.
Here is the post I was talking about. Practically every post by WoRG in this thread is a golden nugget of information.