I have so far found my first summoning doll to be quite useful. I used the increased level upgrade twice with its skill points and 6 with mine. Bringing its level up to 17 in the 1st act which is pretty damn powerful.
That asside I found my 2nd summoning doll in act2 (the demon) I summoned it up and seen its level was 8 and I had no option to increase its level. I decided that I must have to unlearn my Upgrade level skill points and reasign them for it to work. But of course you can not unlearn Summoning doll upgrades.
So anyways heres the questions.

Should I have waited until finding a few more dolls before using the level upgrade?
If The best method is to wait until I have a full array of summoning dolls at my disposal before using lv upgrade then They are pretty much useless until I pump up their levels. For example I have 5 dolls and use 6 skill points I gain 30 levels.
I have 1 doll I use 6 points I only gain 6 levels.

Is the Demon doll level upgradable and am I'm just jumping to conclusions about wasting my skill points?

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