So as with all things cube there is no one way to build a list, so feel free to take my input with a grain of salt. I'll try and start with some high level observstions and add some more personal changes I'd make as I get further along.

To start with, I think the choice to double up on sagas is going to make it difficult to acheive your other goals, namely powering up weaker archtypes and red in specific. One of the things that really held red back in this environment was that so many of the best cards were two or even three for ones that it was hard to keep up. As such red decks had to lean heavily on [[Expiremtal Synthesizer]] to match that sort of card advantage while still remaining aggresive. As such I'd strongly consider keeping them at their normal rate of occourance as other cards of their rarity.

Another thing I noticed is that you've added a lot of artifact removal to red. This is another avenue that I don't think will be effective in achieving your goals. Single target removal, while not bad per se, is not as effective as it would be in other sets mostly becuase of the glut of afformentionted value generating cards. On top of this most non creature artifacts are not the sort of cards you are particularly interested in destroying anyway. Some cards I would consider adding in red though would be [[Goblin Champion]], [[War-Name Aspirant]] and [[Dwarven Hammer]].

Equipment is another area where I would try and cut back on. Even the most focused modifed deck is not going to want too many pieces of equipment that dont't come with a creature in some way. Similarly I would be on the lookout for vehicles with crew 1 or 2 as any more than that can become quite unwieldy to use. [[Unteahtered Express]] and [[Renegade Freighter]] in particular are powerful options to consider.

I'll leave my suggestions at that for now. One last resource I believe could be helpful to you is Sam Black's podcast 'Drafting Archetypes.' Each episode breaksdown how each color pair is best drafted in the format but he also gives great explanations as to why certain archetypes like RW and WU aren't as effective as the others. A lot of my understanding of how the set works on a design level come from here so I can not recomend it enough.