There are a couple of issues here, and hopefully I can explain them well enough to not add confusion.
First of all, if you are concerned about the "loudness" of your recordings compared to commercial recordings, the headphones you use do not matter. Headphone sensitivities vary, but the relative level of different recording played through the same headphones will remain the same. You may have to turn up the volume more for a particular set of headphones to achieve a comfortable loudness level, but that does not explain why your recordings don't sound as loud as commercial recordings played through the same headphones at the same volume control setting.
Secondly, loudness is a psychoacoustic phenomenon that is connected to the average sound level. Sounds that have high peak levels will not sound loud if the average sound level is low. Loud music tends to get noticed more than soft music, especially when that music is played in a noisy environment such as a car. Music that gets noticed sells more. Bands and record companies think that loud music sells more than soft music. Therefore, commercial recordings are often made as "loud" as possible. The way to make the music sound loud is to increase the average level of the music, and they do that by compressing the music's dynamic range. The amount of compression in commercial recordings has increased over the last 15 years or so, and this trend has been called "The Loudness Wars". Each band or label is trying to get their CD to sound louder than everyone else. Whereas live music may have a difference between its average level and its peak level of maybe 20 dB (this difference is called its Crest Factor), commercial recordings, particularly popular music, may have a Crest Factor of only a few dB.
Since you probably do not compress your recordings, they will not sound as "loud" as a highly compressed commercial recording.
Thirdly: I downloaded a few of your recordings and saw that your peak levels were at about -6 dBFS. That is a really nice level to record at, but you can amplify the recording in post to get the peak levels up to about 0 dBFS, making your recordings sound "louder" without decreasing the quality of your recordings. This amplification will not change the Crest Factor, nor the dynamic range, nor anything else in your recording. It will just set the level of your recording to the maximum that can be represented digitally without clipping. Because some D/A converters may not handle a 0 dBFS level properly, I set my max level to -0.3 dBFS, but there is no noticeable loudness difference between -0.3 dBFS and 0 dBFS.
Often times in live recordings the peak level is due to applause, particularly "The Loud Clapper". The Loud Clapper is the guy who sits right next to your mic stand and whacks his hands as hard as he can. These clap peaks can either be edited out, or limited, or ignored (who cares of clapping peaks are clipping?).
I hope the above explanation helps.