Non-Storm Flubs enjoyers, what is your cut off in terms of mana values?

So recently, I've made a flubs deck using all the cards I had at hand to produce this:

https://moxfield.com/decks/TNtSsDo2aUyLnKfPD4NuOg

The initial idea for the deck was flubbing out beaters to beat face with, while I used the several life gain sources to minimize any clapback from my opponents, with the [[Aetherflux Reservoir]] acting as our backup strategy. So as to maximize cards flubbed out, I put in several discard outlets to ensure I remained at a "heckbent" state each turn.

When I took it to my LGS, I got two games out of it and found that there were some kinks in the deck that goldfishing hadn't quite shown to me. While there are plenty of things I could talk about, the one i want to focus on is the matter of mana values. See, some of the most valuable cards I could get in the deck were [[Song of Creation]], [[Wrenn and Realmbreaker]], and [[Abundance]]. However, they also presented the problem of bricking my hand, as I usually lacked the mana to get them out by the time I got to them (this is also a problem suffered by [[Prognostic Sphinx]], but that's only a placeholder I'm using until I can review my discard outlets in the future). What I'm unsure of is how to resolve this issue. Do I add more cheap ramp, so I'm more likely to have enough when I get to flubs? Do I add [[Rummaging Goblin]] effects, so I can replace the card when it bricks? Both? Any help would be appreciated.