I have found bass in earbuds can be very dependent on 1) how deep they enter the ear canal and 2) the foam/tips ability to firmly hold them in place.
I have the Cambridge Audio Melomania 1's. The included foam tips gave better bass than the included silicon tips. I purchased Comply T-5 tips and they were even better and more comfortable. However, after a few weeks, their effectiveness decreased and the earbuds don't generally stay in place very well.
May 2020 update: home is sold, 9.1.4 HT is in storage! Surviving lockdown with Sennheiser HD 58X & Sony WH1000-XM3 & JDS Labs Atom headphones/amp
HT gear: Denon X4400H; Klipsch RP; SVS PC-4000; Buttkicker Advance.
Future upgrades: dual subs; room treatments; Monolith 7x amp; DIY BOSS riser; MiniDSP; speaker upgrades (SVS?)