Which "tweeks" are more important

In line with your thought to try better support for components and speakers, the mini-priced items at Herbiesaudiolab.com are well worth a look (actually, a listen).
To avoid carpet piercing, I support floor standing speakers with Big Fat Black Dots resting on granite or marble tiles from Home Depot. The Dots will surprise you with ability to enable better speaker performance.
The Tenderfoot/feet beneath your components on their existing shelves also are a quick way to upgrade.
Although there is no single answer to what support is the best, these get my nomination for most likely to succeed.
Because these are low cost, money is left over for other ideas already posted.
The ninety day home trial period is enough time for anyone to be sure the results are to their liking.

Dodgealum,
Thanks for informing about the EP2050, and ep2000.com
What is the cost for such an item, since you mentioned it is less expensive than the more conventional approaches?
Their website makes it look easier to implement, too.

Tbg, I understand where you're coming from.
Establishing component synergy is the first step which we all have taken when voicing our systems to our listening room. I have mixed and matched different equipment support ideas with different components as needed to reach what is for me the overall desired sound for the entire system.
But, as you discovered, when modifying the listening environment,which is what I find happens with BP's, I think if you stay within the confines of one manufacturer's repertoire of tweaks you will have the advantage of a consistent (one source) approach to getting the most benefit from basic room/soundspace tuning.
For visual unobtrusiveness, and excellent audible results, I have had wonderful results with a variety of Machina Dynamica products. Even within one company's bag of tricks it is not certain you need every item available. And, placement within the soundfield has to be experimented with.
If you email privately I would be happy to give some details of using Brilliant Pebbles accompanied by other same source ideas.
Luckily, having more than one system has enabled me to find a place for components or add-on's which do not automatically work and play well together.