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Rankups: 6r2 vs R5 (overall opinions)

At what point do you rank to 6r2 over 5r5? I'm now sitting at 26 5r5 and 3 6r2. I feel like i have most of the good tier champs ranked up as well as a few in the tier below. I just don't know what direction to go now as i have 6.4 exploration and all of Abyss left to do
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I'm also taking progression a little bit slow-ish, and trying to be cautious and conservative with my rank-ups. I also wonder if this is the way to go. I wait for level up before I do rank-ups, and all of that kinda stuff. I've done a lot of variants and act 6 completion, so I've got a lot of rankup gems and tier 5 basics.
I know this comment sounds a bit vague, but if someone can share progression tips as they went along, that would be nice.
As for doing 5r5, I only do them if they are extremely useful for lots of content, I.e. Corvus, Ghost, Omega, Doom, and if the champion is not available as a 6.
It’s cheaper resource wise to rank my 5*, and the act 7 beta was doable with 5*. Until R3 is the norm and rank up resources come like candy I’ll continue to choose the 5*
I have a 6*r3 Doom and the next 6* i want to r3 is Ghost & Magneto.