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Isolators under your ARC, I have Nimbus under my REF5se...

arrange to borrow an HRS Turntable platform

Thank you all!!
I will try different power cords, IC’s and isolators first, before changing any of the other components. Thanks again for all your suggestions

bms72, sorry that I am late to the game. You have a nice system. Power cords and isolators are not going to do much. But what will make a significant difference is a new tonearm. I believe you have a unipivot arm on that turntable. Unipivot arms have to many degrees of freedom, they are floppy and hard to keep perfectly aligned. Several cartridge manufacturers such as Lyra recommend against using them. They are particularly bad with medium to low compliance moving coil cartridges such as yours. Moving to an arm with fixed bearings will for certain improve bass and dynamics and may well improve other areas. Look at Origin Live, Kuzma, Reed and many others. VPI also now makes an arm with gimbal  pivots which might be a direct replacement. 

Thanks mijostin. I am certainly not an expert when it comes to tonarms... but I m actually pretty satisfied with the bass and dynamics in my system. My current MC cartridge is a Dynavector 20x2H (high output). 

I am looking for a larger more open soundstage, more liquid, but without loosing the punch. The ML 23.5 does pretty well with my Graham speakers, even though they only go down to 40hz. 

You have gotten alot of different opinions but this is where I would start.  First play with the placement of your speakers.  Sometimes if you find the perfect spot in your room the soundstage will open up and your speakers will deliver what you are looking for.  Next I would look at the platform you have your turntable on.  I have a top notch table but it really improved with a 3" maple platform underneath it.  Cost about $300.

Look at a $1,500 - $2,000 lomc.  That along with better vibration management of your VPI will maximize your front end and possibly astonish you.  

I know nothing about your cables but the attention to your source is where I would start.