Unfortunately Ikenvape has his own way naming LR and HV.
"IKV HV 3.5Ω 510 Atomizer", the standard SLB/DSE 510 atty comes in at 3.2-3.4Ω
"IKV HV 3.5Ω 801 Atomizer", again pretty much standard ohms for an SLB
"IKV HV 901 3.5Ω Atomizer", same thing again pretty much standard ohms for an SLB.
You can get standard SLB/DSE atties for $4.99 at ValueVapor.
None of the above would qualify as HV atties.
At ValueVapor their DSE-901 HV Atomizers come in at 4.5Ω, the HV 510's at 4.8Ω. They don't carry an HV 801 though.
You didn't note what batts or the voltages you are running.