Here’s simply adding to what Frank said.
Varying the rocker ratios between the exhaust and intake valves is common practice on racing engines and is done as a compensation for a camshaft that isn’t exactly what the engine is wanting. There is no set rule as it varies from engine to engine depending upon head flow, intake manifold design, camshaft specs, exhaust sytem, etc. I’ve seen where a 1.2:1 ratio was beneficial because the camshaft was such a mismatch in its partiuclar application so it just depends upon the individual combination as to what the engine likes. What works for a higher ratio on the intakes on one engine may end up being a higher ratio on the exhausts on another engine. Every combination is subtly different.
You can experiment with the 1.43 and 1.54 rockers and potentially find an advantage depending upon your combination but these changes are typically small and usually found on a dyno, not seat of the pants testing. Most cams for the Y will like as much ratio on both valves that you can throw at it though due to most camshafts for the Y being on the mild side. Another item to check is to measure the actual lift at the valve to insure that the ratio is as advertised as there is some error or tolerance in the rocker ratios and also some variability in the ratios depending upon where the adjuster is residing once the valves are set. As a rule, a ‘high’ adjuster is a higher ratio while a ‘low’ adjuster is a lower rocker ratio so you could in effect simply change rocker ratios by changing the length of the pushrods.
And it’s way too early in the morning to be this deep in thought.