Thinking of making a summoner level 4
Level 4 Eidolon
Bipedi have 4 attacks so thats
2x claw with improved damage so 1d6 damage each
1x slam with improved damage so 1d10 damagewhat 4th attack do I get with biped form?
So far with these evolutions its 3 points from the pool.
For the Slam evolution it says you can replace your claw attacks with slam does that mean you get 3 total slam attacks?
A cheap way to get 4 attacks is to add claws to the legs and drop the slam.
Then you can improve all 4 claws as a whole. Depending on how your GM interprets the "one natural attack form" term in the Improved Damage evolution, you can improve the damage for all 4 claws as a whole. You can stack the Improved Natural attack feat on top of this damage to further move the damage die one size category higher. So you can get up to a d8 damage die for each claw. You can also take Weapon Focus (claws) - that will improve your attack roll on all 4 attacks.
The great thing, of course, it gives you 4 attacks with minimal evolution point costs.
And if you are so inclined, you can add additional arms + claws as you level up. (Yes your eidolon will look weird). And all the improvements you've made so far will apply to the claw attacks as well.
I would spend one point of evolutions for second claws evolution, one point for improved damage (claws) and the remaining two points on +2 to Strength.