I don't mind that it's a bit grindy to get the new gun, but please just put all that grind in t3, either by making lower rank spikes randomly drop in higher tiers, or by adding a vendor or crafting recipe to downgrade higher tier spikes to lower rank ones.
I would also much prefer if the spike count didn't move the hotbar.
And I really dislike the sound spikes make when they drop on the floor.
Why not? To me that's a great design choice. Encourage people to play through all of the Clockworks. Plus when you're down there you can pick up some freebie lower-tier orbs.