Sorry I only look after the vanilla version of the game, the Technicians Remix is just too complex for me to cover, it's a little bit of a do it yourself approach.
A few things that may help you is to keep the launcher open and look at the logs as that may show you what's causing the issue.
The next step would be to add each texture mod one at a time and then reload the pack in the game, this would tell you which mod is crashing the game, due to the number of textures and the way all the different mods update at different rates, it can be a game in itself just getting the pack working.
This is the main reason I don't cover the modded textures because it get to the point that just getting it working leaves no time to actually play the game.
I'm currently unable to find a way to fix the texture pack from keeping blocks like 'glass' 'trees' 'bookcases' from being separated. Before they used to be merged together to make one unified texture.
Just curious if you would happen to know how to fix this?
Make sure you are using the correct version of the pack as Resource Packs are made for each version of the game, also note to get the correct version of OptiFine for the version of the game you are playing.
Note that Optifine does not support the snapshot versions.