Try a different style of vaping IMO. There are a lot of persisting misconceptions about what causes undesired side effects in vaping. One example of these misconceptions that is fairly common is that high VG juices are the leading cause of feeling heavy on the chest and/or "people hacking up VG". In the vast majority of cases I've found, the high VG content proved to be NOT the real culprit. Just misuse/mishandling of the vape hardware, and wrong choice of vaping hardware and/or mismatched choice of vaping style.
Low/medium power styles of vaping lend theirself better to comparatively more affordable, small and compact, convenient to use types of hardware choices. That is, in contrast to a high powered vaping style at something like maybe 90 watts or above. As a direct result from this, not too many people understand anything much about the latter style, or what exactly it is that can be had from it after you walk the extra mile of doing it right. Not that doing it right will give you the guarantee that you will actually prefer it. Just that, for most, it [the high wattage vaping style] will give a bigger chance of simply fucking it up, because it takes more doing one's own personal research, more time, and more effort and perseverance to get it right, eventually. That is, in most cases anyway, it just turns out that it does.
That being said, I find that high wattage DL vaping high VG juices on an RDA using (decently) handbuilt complex coil builds such as, for example, alien coils that specifically are made from relatively thin Nichrome 80 wires, to me, personally, actively prevents the irritation/inflammation of my respiratory system I get from MTL, restricted DL, and "low-medium restrictiveness" DL. I am using the type of DL that can be accurately described as "only just moderately restricted", with the airflow smashing right into the coils to prevent overheating the coils and juice. My speed of inhalation is virtually the same as how the average person just breathes normally, and, I don't inhale deep. Factory premade coils in a subohm tank just make me want to gag. No exaggeration. But I'm not making any assumptions about what's causing your problem. Rather, I only point out what I have learned from my own personal experiences in cohort with observations made by people I have met, in person. People who like to vape somewhat similar to how I go about it aren't usually very talkative on the internet when it comes to sharing in-depth info of how they all fine tune all the various parameters─the detailed specifics of what affects their vape experience in one way or another, and of how it is affected to what extent. That's just because too many trolls are waiting just behind the corner so, as a logical result, almost all of us either have gone completely silent or have moved to private groups that are buried so deeply underground that the trolls now keep getting all bored as fuck wondering where that might be.
My advice to you and to anyone else who can't get a satisfying vape is: go shopping. Find out what's out there... you'll thank yourself later.