Costar stabs are very workable, you can make them work however you want
I personally bend the ends upwards a bit, also clip the inner sides of the inserts, this way they have a stronger grip, they grip both sides, so the clinkiness is reduced to 0, you get a smooth keypress wherever you press the key from (I was going to make a post describing this process, but never got around to it, this comes close: https://geekhack.org/index.php?topic=72076.0 - it's really hard to get it right tho)
You can also lube various parts of the assembly to make things smoother, but it's always better to solve issues without the lube, then add the lube later on for smoothness + longevity
As another suggestion, make sure you have a lot of spare inserts, wires, holders etc. 
Edit: it doesn't grind but now it occasionally sticks at the bottom of the press, any ideas?
Thanks for the suggestions by the way! By bend the ends upwards, do you mean if the wire is on a flat surface, to bend the small ends upwards? Also, how would clipping the inserts lead to a stonger grip?
Lastly, you mentioned that the brown's aren't the best for this issue so do you think it would help at all if I put a clear in for my spacebar?
shave the inner side of the keycap with a dremel, it seems like you have a keycap incompatibility, since the new keyset caused the issues, but verify that the wire indeed touches the keycap first
I bend the small ends upwards from the resting position, I clip the inserts, as bending the upwards makes the wire eat the insert, by clipping the inner part, the slightly upwards bended wire is able to roam freely, but this mod is too much at this stage, first solve the grinding issue
Putting in a clear spring can suppress the issue, but the issue will still be there
I use Cherry MX Red's to calibrate my stabiliser wires, the weak linear switch is the best to tune the stabiliser, I then install the modded wire/keycap into the actual keyboard (have several stabiliser tuning plates)
