To be honest, you could probably dump the spare battery. Simply because, if you keep up on your kit maintenance, the battery should be good. And, its used intermittently-moving at night, unless you absolutely have to, in a survival situation, can put you in more danger than you already are. I dont carry spare batteries in any of my kits-its a personal choice of mine, I thought I would pass along.
Also, I echo the comment on the tape-stick with quality duct tape-no need to carry both. If you're concerned about using the medi-tape for medical stuff-many folks on here, including myself, can attest that duct tape and a piece of T shirt can double as a bandage. Duct tape is included in most manufactured kits for a reason .
I would suggest a SAK with a saw blade, and toss the razor blades. I see that you have an SAK OHT-I will be honest, I have no clue what that is. A rule of thumb though-minimize what you carry, and maximize its usage. IF you can get one tool that does several jobs, use that. A SAK with a saw blade is your knife, saw, and whatever other tools it comes with. SAKs are great to pack-multitools are the rage now, but a good quality SAK is a great tool to throw in a kit.
I LOVE the mosquito headnet. Thats something I need to pack in mine!
Overall, I think your kit is great. The fun part is tweaking-I have been doing that for YEARS, and still am not satisfied with what I have