Your worry about these clusters is probably that you are trying too hard to pronounce every consonant sound out clearly.
Most native speakers of English will miss consonants at their convenience. This — you will be pleased to know — is because they also find it difficult to say "sixth!"
The secret is to note the way native speakers deal with these clusters and copy them.
For example, "months" is often pronounced "munts;" "clothes" is pronounced "cloze;" "Smiths" can be pronounced "Smiss."
This is what I do, but you can continue being extra careful with your consonants if you wish ...
It's up to you!
Jim Kell is Bell Cambridge's Academic Manager. You can send questions to him directly on jim.kell@bell-schools.ac.uk