Hey I love sliver deck too and maybe I have a few suggestions
Consider cutting down the number of cards, I know it's hard cause you love all the slivers and each of them seems like a good boost for the swarm. But having all those cards make a very unstable deck and the right mana source will be hard to come by for the right sliver. 60 is the minimum and the best !
Also consider gettin some special land to adress this issue like
Sliver Hive and
Ancient Ziggurat it will allow you to play easier most of the sliver. Otherwise you can try to use only maybe 3 colors to cut down the need for those lands.
I recommand having mostly cheap sliver (in mana) to play and a few more expensive to come around when needed.
(also be aware that
Diffusion Sliver stacks.
Venom Sliver goes well with
Striking Sliver and/or
Quilled Sliver)