I only noticed that developping a SR weapon to lvl 10 gives it another 25%, which makes it a total of 50% when used as material SLVL on my SSR weapon SLVL7 Atk (++). So going from that 1 SR weapon lvl 30 can get my SSR weapon SLVL7 to SLVL8.
Oh gawd if only I know that much sooner...
Oh that's right. SLVL was actually what mattered, sorry didn't notice it until you mention it, and tested it myself. Well that actually makes things easier.
Also by 1+2+3, do you mean I should rise the SR's SLVL to 3 before I use it as material SLVL for higher SSR SLVL? Also what's the SLVL cap?
You need 1 R to get a SR weapon to slvl 2, then 2 to get to slvl 3, then 3 to get to slvl 4. After that, using any more Rs doesn't make sense since you'd pay 40 points to gain 35 points.
I wish that you could just throw 6 Rs into a slvl 1 SR and go directly to slvl 4, but sadly... 1+2+3.20.
And in case you don't know, each level is 0.5% gain.
Which is why you never, ever do anything except 100% chances. It can only bite you in the long run.
In before some smartypants goes "I did a skill level up with 3% chance, it's good!111"